Foreign intelligence The first intelligence agent enlisted by the Secret Correspondence Committee was Arthur Lee, then living in London. On November 30, 1775, the day after its founding, the Committee appointed Lee as its agent in England and told him that "it is considered of the utmost consequence to the cause of liberty that the Committee is kept informed of developments in Europe." Following the first Congressional appropriation for the work of the Committee on December 11, 1775, two hundred
pounds was forwarded to Lee with the urging that he finds out the "disposition of foreign powers towards us, and the admonition that we need not hint that great circumspection and impenetrable security are necessary." The next agent recruited abroad by the committee was
Charles W. F. Dumas, a Swiss journalist at
The Hague. Dumas was briefed personally by Thomas Story, a
courier of the committee, and instructed on the use of cover names and letter drops to be used for his reports to the committee and communication with Lee in London. He also planted stories in a
Dutch newspaper,
Gazette de Leide, intended to give the United States a favorable rating in Dutch credit markets. On March 1, 1776, the Committee appointed Silas Deane, a former delegate to Congress and future
ambassador to France, as its agent there. He was instructed to pose as a Bermudian merchant dealing in Indian goods. He was also charged with making secret purchases and with attempting to gain secret assistance from the
French crown. Later, both Deane and Lee would be converted from agents to commissioners to the French Crown, albeit secret ones, until the open and formal alliance of France with the Americans. Other agents of the Committee included
William Bingham, who served first in France and then in
Martinique, where he had once been British
Consul; Major
Jonathan Loring Austin,
William Carmichael, and William Hodge.
Secrecy and protection The Committee of Secret Correspondence insisted that matters about the funding and instruction of intelligence agents be held within the committee. In calling for the Committee members to "lay their proceedings before Congress," the Congress, by resolution, authorized "withholding the names of the persons they have employed, or with whom they have corresponded." On May 20, 1776, when the committee's proceedings—with the sensitive names removed—were finally read in the Congress, it was "under the injunction of secrecy." The Continental Congress, recognizing the need for secrecy regarding foreign intelligence, foreign alliances, and military matters, maintained "Secret Journals," apart from its public journals, to record its decisions in such matters. On November 9, 1775, the Continental Congress adopted its oath of secrecy, one more stringent than the oaths of secrecy it would require of others in sensitive employment. On June 12, 1776, the Continental Congress adopted the first secrecy agreement for employees of the new government. The required oath read: I do solemnly swear, that I will not directly or indirectly divulge any manner or thing which shall come to my knowledge as (clerk, secretary) of the board of War and Ordnance for the United Colonies... So help me God. The Continental Congress, sensitive to the vulnerability of its covert allies, respected their desire for strict secrecy. Even after France declared war against England, the fact of French involvement before that time remained a state secret. When
Thomas Paine, in a series of letters to the press in 1777, divulged details of the secret aid from the files of the Committee of Foreign Affairs (formerly, the Committee of Secret Correspondence), France's Minister to the United States,
Conrad Alexandre Gérard de Rayneval, protested to the president of the Congress that Paine's indiscreet assertions "bring into question the dignity and reputation of the King, my master, and that of the United States." Congress dismissed Paine, and by public resolution denied having received such aid, resolving that "His Most Christian Majesty, the great and generous ally of the United States, did not preface his alliance with any supplies whatever sent to America." In 1779, George Washington and
John Jay, the president of the Continental Congress and a close associate of the Commander in Chief's on intelligence matters, disagreed about the effect disclosure of some intelligence would have on sources and methods. Washington wanted to publicize certain encouraging information that he judged would give "a certain spring to our affairs" and bolster public morale. Jay replied that the intelligence "is unfortunately of such a Nature, or rather so circumstanced, as to render Secrecy necessary." Jay prevailed.
Cover Robert Townsend, an important American agent in the British-occupied city of New York, used the guise of being a merchant, as did
Silas Deane when he was sent to France by the Committee of Secret Correspondence. Townsend was usually referred to by his cover name of "Culper, Junior." When Major
Benjamin Tallmadge, who directed Townsend's espionage work, insisted that he disengage himself from his cover business to devote more time to intelligence gathering, General Washington overruled him. Townsend also was the silent partner of a coffee house frequented by British officers, an ideal place for hearing loose talk that was of value to the American cause. Major
John Clark's agents in and around British-controlled Philadelphia used several covers (farmer, peddler, and smuggler, among others) so effectively that only one or two operatives may have been detained. The agents traveled freely in and out of Philadelphia and passed intelligence to Washington about British troops, fortifications, and supplies, and of a planned surprise attack.
Enoch Crosby, a counterintelligence officer, posed as an unsuspecting shoemaker (his civilian trade) to travel through southern New York state while infiltrating Loyalist cells. After the Tories started to suspect him when he kept "escaping" from the Americans, Crosby's superiors moved him to
Albany, New York, where he resumed his undercover espionage.
John Honeyman, an Irish weaver who had offered to spy for the Americans, used several covers (butcher, Tory, British agent) to collect intelligence on British military activities in
New Jersey. He participated in a deception operation that left the
Hessians in
Trenton unprepared for
Washington's attack across the
Delaware River on December 26, 1776.
Disguise In January 1778, Nancy Morgan Hart, who was tall, muscular, and cross-eyed, disguised herself as a "touched" or emotionally disturbed man, and entered
Augusta, Georgia, to obtain intelligence on British defenses. Her mission was a success. Later, when a group of Tories attacked her home to gain revenge, she captured them all and was witness to their execution. In June 1778, General Washington instructed
Henry "Light Horse Harry" Lee to send an agent into the British fort at
Stony Point, New York, to gather intelligence on the exact size of the garrison and the progress it was making in building defenses. Captain Allan McLane took the assignment. Dressing as a
country bumpkin and utilizing the cover of escorting a Mrs. Smith into the fort to see her sons, McLane spent two weeks collecting intelligence within the British fort and returned safely. While serving in Paris as an agent of the Committee of Secret Correspondence, Silas Deane is known to have used a heat-developing
invisible ink—a compound of cobalt chloride, glycerine, and water—for some of his intelligence reports back to America. Even more useful to him later was a "sympathetic stain" created for secret communications by James Jay, a physician and the brother of
John Jay. Jay, who had been knighted by
George III, used the "stain" for reporting military information from London to America. Later he supplied quantities of the stain to George Washington at home and to Silas Deane in Paris. The stain required one chemical for writing the message and a second to develop it, affording greater security than the ink used by Deane earlier. Once, in a letter to John Jay, Robert Morris spoke of an innocuous letter from "Timothy Jones" (Deane) and the "concealed beauties therein," noting "the cursory examinations of a sea captain would never discover them but transferred from his hand to the penetrating eye of a Jay, the diamonds stand confessed at once." Washington instructed his agents in the use of the "sympathetic stain," noting in connection with "Culper Junior" that the ink "will not only render his communications less exposed to detection, but relieve the fears of such persons as may be entrusted in its conveyance." Washington suggested that reports could be written in invisible ink "on the blank leaves of a pamphlet... a common pocket book, or on the blank leaves at each end of registers, almanacs, or any publication or book of small value." Washington especially recommended that agents conceal their reports by using the ink in correspondence: "A much better way is to write a letter in the Tory stile with some mixture of family matters and between the lines and on the remaining part of the sheet communicate with the Stain the intended intelligence." Even though the Patriots took great care to write sensitive messages in invisible ink, or code or cipher, it is estimated that the British intercepted and decrypted over half of America's secret correspondence during the war.
Codes and ciphers American Revolutionary leaders used various methods of
cryptography to conceal diplomatic, military, and personal messages. John Jay and Arthur Lee devised dictionary codes in which numbers referred to the page and line in an agreed-upon dictionary edition where the plaintext (unencrypted message) could be found. In 1775, Charles Dumas designed the first diplomatic cipher that the Continental Congress and Benjamin Franklin used to communicate with agents and ministers in Europe. Dumas's system substituted numbers for letters in the order in which they appeared in a preselected paragraph of French prose containing 682 symbols. This method was more secure than the standard alphanumeric substitution system, in which a through z are replaced with 1 through 26 because each letter in the plain text could be replaced with more than one number. The
Culper Spy Ring used a numerical substitution code developed by Major
Benjamin Tallmadge, the network's leader. The Ring began using the code after the British captured some papers indicating that some Americans around New York were using "sympathetic stain." Tallmadge took several hundred words from a dictionary and several dozen names of people or places and assigned each a number from 1 to 763. For example, 38 meant to attack, 192 stood for the fort, George Washington was identified as 711, and New York was replaced by 727. An American agent posing as a deliveryman transmitted the messages to other members of the Ring. One of them,
Anna Strong (spy), signaled the message's location with a code involving laundry hung out to dry. A black petticoat indicated that a message was ready to be picked up, and the number of handkerchiefs identified the cove on
Long Island Sound where the agents would meet. By the end of the war, several prominent Americans—among them Robert Morris, John Jay, Robert Livingston, and John Adams—were using other versions of numerical substitution codes. The Patriots had two notable successes in breaking British ciphers. In 1775,
Elbridge Gerry and the team of Elisha Porter and the Rev. Samuel West, working separately at Washington's direction, decrypted a letter that implicated Benjamin Church, the Continental Army's chief surgeon, in espionage for the British. In 1781, James Lovell, who designed cipher systems used by several prominent Americans, determined the encryption method that British commanders used to communicate with each other. When a dispatch from
Lord Cornwallis in
Yorktown, Virginia, to General
Henry Clinton in New York was intercepted, Lovell's cryptanalysis enabled Washington to gauge how desperate Cornwallis's situation was and to time his
attack on the British lines. Soon after, another decrypt by Lovell provided a warning to the French fleet off Yorktown that a British relief expedition was approaching. The French
scared off the British flotilla, sealing the victory for the Americans.
Intercepting communications The Continental Congress regularly received quantities of intercepted British and Tory mail. On November 20, 1775, it received some intercepted letters from
Cork, Ireland, and appointed a committee made up of John Adams, Benjamin Franklin, Thomas Johnson, Robert Livingston, Edward Rutledge, James Wilson and George Wythe "to select such parts of them as may be proper to publish." The Congress later ordered a thousand copies of the portions selected by the committee to be printed and distributed. A month later, when another batch of intercepted mail was received, a second committee was appointed to examine it. Based on its report, Congress resolved that "the contents of the intercepted letters this day read, and the steps which Congress may take in consequence of said intelligence thereby given, be kept secret until further orders." By early 1776, abuses were noted in the practice, and Congress resolved that only the councils or committees of the safety of each colony, and their designees, could henceforth open the mail or detain any letters from the post. When Moses Harris reported that the British had recruited him as a courier for their Secret Service, General Washington proposed that General Schuyler "contrive a means of opening them without breaking the seals, take copies of the contents, and then let them go on. By these means, we should become masters of the whole plot." From that point on, Washington was privy to British intelligence pouches between New York and Canada.
Technology James Jay used the advanced technology of his time in creating the invaluable "sympathetic stain" used for secret communications. Perhaps the American Patriots' most advanced application of technology was in
David Bushnell's
Turtle, a one-man submarine created for affixing watchword-timed explosive charges to the bottoms of enemy ships. The "turtle," now credited with being the first use of the submarine in warfare, was an oaken chamber about wide and high. It was propelled by a front-mounted, pedal-powered propeller at a speed of up to , had a
barometer to read depth, a pump to raise or lower the submarine through the water, and provision for both lead and water
ballast. When Bushnell learned that the candle used to illuminate instruments inside the "turtle" consumed the oxygen in its air supply, he turned to Benjamin Franklin for help. The solution: the phosphorescent weed,
foxfire. Heavy tides thwarted the first sabotage operation. A copper-clad hull that could not be penetrated by the submarine's auger foiled the second. (The "turtle" did blow up a nearby schooner, however.) The secret weapon would almost certainly have achieved success against a warship if it had not gone to the bottom of the
Hudson River when the mother ship to which it was moored was sunk by the British in October 1776. An early device developed for concealing intelligence reports when traveling by water was a simple weighted bottle that could be dropped overboard if there was a threat of capture. This was replaced by a wafer-thin leaden container in which a message was sealed. It would sink in water, melt in a fire, and could be used by agents on land or water. It had one drawback—
lead poisoning if it was swallowed. It was replaced by a silver, bullet-shaped container that could be unscrewed to hold a message and which would not poison a courier who might be forced to swallow it.
Deception operations To offset British superiority in firepower and number of troops, General Washington made frequent use of deception and
disinformation. He allowed fabricated documents to fall into the hands of enemy agents or be discussed in their presence. He allowed couriers carrying bogus information to be "captured" by the British, and inserted forged documents in intercepted British communications that were then permitted to continue to their destination. He had army procurement officers make false purchases of large quantities of supplies in places picked to convince the British that a sizable rebel force was massing. Washington even had fake military facilities built. In all this, he managed to make the British believe that his three-thousand-man army outside Philadelphia was forty thousand strong. After learning from the Culper Ring that the British planned to attack a French expedition that had just landed in
Newport, Rhode Island, Washington planted information with known British agents indicating that he intended to move against New York City. The British commander held back the troops headed for Rhode Island. With elaborate deception, Washington masked his movement toward the Chesapeake Bay and Yorktown by convincing the British that he was moving on to New York. At
Yorktown,
James Armistead, a
slave who had joined Lafayette's service with his master's permission, crossed into Cornwallis' lines in the guise of an escaped slave, and was recruited by Cornwallis to return to American lines as a spy. Lafayette gave him a fabricated order that was destined for a large number of nonexistent replacements. Armistead delivered the bogus order in crumpled, dirty condition to Cornwallis, claiming to have found it along the road during his mission. Cornwallis believed him and did not learn he had been tricked until after his surrender. Armistead was granted his freedom by the
Virginia General Assembly as a result of this and other wartime services. Another deception operation at Yorktown found
Charles Morgan entering Cornwallis' camp as a deserter. When debriefed by the British, he convinced them that Lafayette had sufficient boats to move all his troops against the British in one landing operation. Cornwallis was duped by him and dug in rather than marched out of Yorktown. Morgan, in turn, escaped in a British uniform and returned to the American lines with five British deserters and a prisoner.
Propaganda Upon receiving accurate intelligence that the British were hiring
Hessian auxiliaries for service in America, Congress appointed a three-man committee "to devise a plan for encouraging the Hession and other foreigners... to quit that iniquitous service." The result was a resolution, believed to have been drafted by
Thomas Jefferson, offering land grants to
German deserters. It was translated into German and sent to the Hessians. Benjamin Franklin, who joined the committee to implement the operation, arranged for the leaflets to be disguised as tobacco packets to make sure they would fall into the hands of ordinary Hessian soldiers.
Christopher Ludwick was dispatched by Washington into the enemy camp, posing as a deserter, to contact the Hessians and encourage them to defect. He is credited with the defection of "many hundred soldiers" from the German ranks. In 1777, after he arrived in France, Benjamin Franklin fabricated a letter purportedly sent by a German prince to the commander of his troops in America. The letter disputed British casualty figures for the German troops, arguing that the actual number was much higher and that he was entitled to a great amount of "
blood money", the amount paid to the prince for each of his men killed or wounded. The prince also encouraged the officer to be humane and to allow his wounded to die, rather than try to save men who might only become cripples unfit for service to their prince. Between 5,000 and 6,000 Hessians deserted to the American side during the war, in part because of US propaganda. Franklin also wrote a fake newspaper report which purported to detail the transmittal of American scalps to the
governor of Canada by British-allied
Indians. The Indian transmittal letter was intended to be published in Britain with the aim of making the British public more amenable to peace negotiations with the United States. ==Intelligence analysis and estimates==