On April 11, 1776, the Continental Congress issued a commission authorizing John Adams, a mariner, to command the sloop
Chance as a privateer which had been given a
Letter of marque. The vessel, owned by Joseph Dean, Philip Moore & Co. of Philadelphia, was licensed to attack and seize British ships. The captured vessels were to be brought to colonial ports for legal condemnation as lawful prizes. The commission required adherence to the customs of civilized nations and was signed by
John Hancock and
John Adams, remaining in force until further notice from Congress. On June 17, 1776, the Committee of Safety issued commissions to Wingate Newton and John Craig to command privateer vessels. Wingate Newton was granted command of the brigantine
Hancock, armed with twelve carriage guns, and owned by John Bayard, John Dean, & Company. John Craig was given command of the sloop
Congress, a privateer of seventy tons, with six cannons and thirty men, also owned by John Bayard, Joseph Dean, & Company. These commissions were granted in accordance with a resolve from Congress. In August 1776, the sloop
Congress seized the British brig
Richmond, which amounted to a prize of over 20,000 sterling. In October 1776, the sloop
Congress had instructions from the Commander in Chief of the Philadelphia armed boats (privateering vessels), Andrew Caldwell (1722–1788), to not pursue any British vessels from Bermuda or the Caribbean Islands. The sloop
Congress became infamous to the British Navy for its
Capture of HMS Savage in 1781. During the Pennsylvania Provincial Conference in June 1776 Dean was one of 93 delegates voting to declare Pennsylvania's support for independence from England. Representing Philadelphia included,
Timothy Matlack, Benjamin Franklin, Col. Joseph Dean, Samuel Cadwalader Morris, Capt.
Jonathan Bayard Smith, Col.
Thomas McKean,
John Bayard, and Francis Gurney. In December 1776, Dean was appointed to the Committee of Safety by the
Pennsylvania Assembly. On April 14, 1777, Dean was appointed onto the newly established Pennsylvania Board of War by
Thomas Wharton, alongside
David Rittenhouse,
Samuel Morris, William Moore, and Owen Biddle. Robert Morris was selected as a delegate in the same announcement to the Continental Congress. From 1776 - 1779, Dean's cousin's father-in-law, William Morris, also served as a privateer and captain in Virginia and was appointed by the Virginia Board of Trade to superintendent of the shipyard at Cumberland on the York River from 1779 - 1780 until it was shut-down, and later he was superintendent of the shipyard on the Pamunkey River until it was destroyed during the
Siege of Yorktown. Morris oversaw the Commercial Department relating to import-export during the latter years of the war. In 1780, he was one of the Auditors for the Pennsylvania Council on Safety. Also in 1780, Lt. Colonel Joseph Dean was commander of the 4th Battalion in the Philadelphia City Militia. On April 21, 1783, he was promoted Colonel with command over the 6th Battalion, Second Troop Philadelphia City Cavalry. In January 1781, he was chosen by the Supreme Executive Council as Auditor of Public Accounts and Commissioner of Philadelphia County responsible for settling and adjusting the accounts of Pennsylvania troops serving the United States. He was a signer of several Pennsylvania paper currencies including the nine pence bill. Later that year, he was appointed Warden of the Port of Philadelphia. In 1790, he was selected as an auctioneer for the city. During the Revolution, Dean was a significant financial supporter of the American cause. He loaned the general government $60,000, a substantial sum at the time, which he ultimately lost and resulted in bankruptcy. Dean's financial contributions were acknowledged by Robert Morris, who was a member of the Pennsylvania delegation in Congress. After the Revolution, Joseph Dean invested heavily in real estate, purchasing properties that had been confiscated from loyalists and other attainted individuals, as well as receiving properties as payment for his loans to the government. ==Personal life and death==