British plans In 1814, most of Britain's army was engaged in the
Peninsular War in Spain. Then in April,
Napoleon I abdicated the throne of France. This provided Britain the opportunity to send 16,000 veteran troops from the Peninsula and other garrisons to North America. Several experienced Major-Generals were also detached from the
Duke of Wellington's army to command them. The
Secretary of State for War and the Colonies, the
Earl of Bathurst, sent instructions to Lieutenant-General Sir George Prevost, the Commander-in-Chief in Canada and Governor General of the Canadas, authorizing him to launch offensives into American territory, but cautioning him against advancing too far and thereby risking being cut off. Bathurst suggested that Prevost should give first priority to attacking
Sackett's Harbor on
Lake Ontario, where the American fleet on the lake was based, and seize control of
Lake Champlain as a secondary objective. Prevost lacked the means to transport the troops necessary for an attack on Sackett's Harbor and the supplies for them up the
Saint Lawrence River. Furthermore, the American ships controlled Lake Ontario, making an attack impossible until the British launched the
first-rate ship of the line HMS St. Lawrence on 15 October, too late in the year for major operations to be undertaken. Prevost therefore prepared to launch his major offensive to Lake Champlain, up the
Richelieu River. (Since the Richelieu was the only waterway connecting Lake Champlain to the ocean, trade on the lake naturally went through Canada.) Prevost's choice of route on reaching the lake was influenced by the attitude of the American state of
Vermont, on the eastern side of the lake. The state had shown itself to be less than wholeheartedly behind the war and its inhabitants readily traded with the British, supplying them with all the cattle consumed by the British army, and even military stores such as masts and spars for the British warships on Lake Champlain. To spare Vermont from becoming a seat of war, Prevost therefore determined to advance down the western,
New York State, side of the lake. The force numbered 11,000 in total. However, some units were detached and some sick men did not take part, so the actual number of troops present at Plattsburgh was just over 8,000. Prevost's Quartermaster General, Major General
Thomas Sydney Beckwith, was a veteran of the early part of the Peninsular campaign and of operations in
Chesapeake Bay in 1813, but even he was to be criticized, mainly for failures in the
intelligence. On the American side of the frontier, Major General
George Izard was the commander of the
Northern Army, deployed along the Northeast frontier. In late August, Secretary of War
John Armstrong ordered Izard to take the majority of his force, about 4,000 troops, to reinforce Sackett's Harbor. Izard's force departed on 23 August, leaving Brigadier General Alexander Macomb in command at Plattsburgh with only 1,500 American
regulars. Most of these troops were recruits, invalids or detachments of odds and ends. Macomb ordered General
Benjamin Mooers to call out the New York
militia and appealed to the governor of Vermont for militia volunteers. 2,000 troops eventually reported to Plattsburgh under the command of Major General
Samuel Strong. Macomb put these recent volunteers to work digging trenches and building fortifications. Macomb's main position was a ridge on the south bank of the
Saranac River. Its fortifications had been laid out by Major
Joseph Gilbert Totten, Izard's senior Engineer officer, and consisted of three
redoubts and two
blockhouses, linked by other fieldworks. The position was reckoned to be well enough supplied and fortified to withstand a siege for three weeks, even if the American ships on the lake were defeated and Plattsburgh was cut off. The losses they inflicted and the restriction they imposed on the movement of men and supplies to Plattsburgh contributed to the defeat of Major General
Wade Hampton's advance against Montreal, which finally ended with the
Battle of the Chateauguay. Lieutenant Thomas Macdonough, commanding the American naval forces on the Lake, established a secure base at
Otter Creek (Vermont), and constructed several gunboats. He had to compete with Commodore
Isaac Chauncey, commanding on
Lake Ontario, for seamen, shipwrights and supplies, and was not able to begin constructing larger fighting vessels until his second-in-command went to
Washington to argue his case to the
Secretary of the Navy,
William Jones. Naval architect
Noah Brown was sent to Otter Creek to superintend construction. In April 1814, the Americans launched the corvette of 26 guns and the
schooner of 14 guns (originally a part-completed steam vessel). Only a few days before the Battle of Plattsburgh, the Americans also completed the 20-gun
brig . The loss of their former supremacy on Lake Champlain prompted the British to construct the 36-gun
frigate at Ile aux Noix. Captain
George Downie was appointed to command soon after the frigate was launched on 25 August, replacing Captain Peter Fisher, who in turn had superseded Pring. Like Macdonough, Downie had difficulty obtaining men and materials from the senior officer on Lake Ontario, Commodore
James Lucas Yeo, and Macdonough had intercepted several spars which had been sold to the British by Vermonters; American Midshipman
Joel Abbot led a
cutting-out expedition which destroyed several of the spars. Downie could promise to complete
Confiance only on 15 September, and even then the frigate's crew would not have been exercised. Prevost was anxious to begin his campaign as early as possible, to avoid the bad weather of late autumn and winter, and continually pressed Downie to prepare
Confiance for battle more quickly. However, at the time of the battle
Confiance mounted only 16
12-pounder long guns and was crewed largely by untrained provincials. ==Invasion==