When
war was declared on June 18, 1812, Captain
Benjamin Forsyth's company of the regiment was stationed in New York City. In July 1812, Forsyth led his company to
Sacketts Harbor, New York from which, on September 20–21, 1812, he, his company and supporting militia attacked British stores at
Gananoque, Upper Canada. Forsyth surprised the Canadian militiamen and was able to capture muskets, ammunition and prisoners. Forsyth's party set fire to stores they could not carry and returned safely to Sackets Harbor from the raid. Forsyth's losses were one man killed and one wounded. In October 1812, two companies of riflemen were assigned to participate in the
Battle of Queenston Heights; however disagreement between Major General
Stephen Van Rensselaer and Brigadier General
Alexander Smyth resulted in those companies being withdrawn because Smyth thought it more important that they clean their camp following a storm. Ultimately, the U.S. attempt to take Queenston failed. Forsyth's riflemen where then employed as an advance force and on November 7–9, 1813 they engaged a large Canadian force at Hoople's Creek near Cornwall, Upper Canada, concurrent with the
Battle of Crysler's Farm. Although the riflemen performed well and the Americans persevered at Hoople's Creek, the Canadians drove the Americans from the farm and Major General
James Wilkinson withdrew to winter quarters. Forsyth was killed in action on June 28, 1814. Riflemen under the command of Major
Daniel Appling participated in the
Battle of Big Sandy Creek on May 30, 1814, during which they ambushed and captured a large detachment of British sailors, including two Royal Navy captains, and Royal Marines, sparing a shipment of large cannon from capture. Appling was brevetted to lieutenant colonel on May 30, 1814 for gallantry and to colonel on September 11, 1814 for distinguished service. On August 3, 1814, another detachment of riflemen under the command of Major Ludowick Morgan ambushed and repelled a British raid at Conjockta Creek near Buffalo, New York, prior to the
Siege of Fort Erie. Morgan and his troops, along with elements of the 4th Regiment of Riflemen, helped relieve the siege. Morgan was killed in action on August 12, 1814. The regiment's last wartime action occurred after Britain and the United States agreed to end the war in the
Treaty of Ghent. On January 13, 1815,
Royal Marines and troops of the
2nd West India Regiment landed near
Fort Peter,
Saint Marys, Georgia. Captain Abraham A. Massais, who was commanding a force consisting of a company of the Regiment of Riflemen and a company of the 42nd Infantry Regiment, decided his command was outnumbered and executed a fighting retreat. The British demolished Fort Peter and re-embarked. == Post-war ==