Not far west of Lexington, Smith was wounded in the thigh in an ambush by Lexington militia, led by John Parker in what has been called "Parker's Revenge". Smith gave up his horse so that more badly wounded men could use it. His column was extremely hard-pressed and close to total collapse but managed to reach the comparative safety of Lexington where a brigade of British reinforcements under General Percy had arrived. Percy took command and his reinforcements became the rear guard and the flankers of the expedition while Smith's tired troops became the advance guard. In Menotomy, they came under further attack from freshly-arrived militiamen and had to clear several houses in further heavy fighting. It was not until Smith's men reached Charlestown, that the threat of attack ended.