Mercer, George's slightly younger brother, was killed and scalped at Edwards's Fort in April 1756. In 1758, George Mercer accepted command of the newly formed Second Virginia Regiment, with a commission as lieutenant colonel. In 1758, the governor assigned both Virginia regiments to regular British Army Brigadier General John Forbes, who planned to march from Philadelphia westward and take Fort Duquesne in the western frontier. On November 12, while on patrol from Fort Ligonier to repel French and Indian raids, the 2nd Virginia accidentally engaged Washington and the 1st Virginia in a heavy fog and at night. Two officers and 38 men were killed or wounded in the friendly fire incident. After the war, Mercer accepted appointment as Assistant Deputy Quartermaster-General for Maryland and Virginia (1759). Then, in 1761, Frederick County voters elected him as one of their two representatives in the House of Burgesses together with George Washington. During this time, Mercer also speculated in Ohio River Valley lands in his own right. However, he was not re-elected as a Burgess. Mercer had sailed to England as the Ohio Company of Virginia's agent, and while there accepted appointment as royal Stamp Collector for Maryland and Virginia. The Stamp Act (one of the Intolerable Acts) was a British law to recoup funds spent on the French and Indian War – and highly unpopular in Virginia. When Mercer arrived in Williamsburg in late October 1765 to attend the General Court, he experienced violent protests as well as condemnation in the Virginia Gazette. He resigned as tax collector and arranged for the stamps to be kept aboard a royal warship, and his brother James' support prevented physical injury. Mercer was also later appointed Governor of North Carolina, but never assumed that position. Before his father's death in 1768, Mercer returned to England as the Ohio Company's agent. He received a full share when he arranged for the Ohio Company to merge with the Vandalia Company in 1770 (creating the Grand Ohio Group) while the remaining Ohio Company shareholders split two shares, though he continued to pester George Mason as the Ohio Company treasurer for funds. Mercer also married and was widowed in England, where he remained as a Loyalist during the American Revolutionary War. He died in London in 1784. Death and legacy Mercer died in London and was buried there. His nephew Charles Fenton Mercer possessed many of his papers, and