at age 98.) All told, far more blood was shed in Menotomy and Cambridge than elsewhere that day. The colonists lost 25 men killed and nine wounded there, and the British lost 40 killed and 80 wounded, with the 47th Foot and the Marines suffering the highest casualties. Each was about half the day's fatalities. Menotomy to Charlestown The British troops crossed the Menotomy River (today known as Alewife Brook) into Cambridge, and the fight grew more intense. Fresh militia arrived in close array instead of in a scattered formation, and Percy used his two artillery pieces and flankers at a crossroads called Watson's Corner to inflict heavy damage on them. Earlier in the day, Heath had ordered the Great Bridge to be dismantled. Percy's brigade was about to approach the broken-down bridge and a riverbank filled with militia when Percy directed his troops down a narrow track (now Beech Street, near present-day Porter Square) and onto the road to Charlestown. The militia (now numbering about 4,000) were unprepared for this movement, and the circle of fire was broken. An American force moved to occupy Prospect Hill (in modern-day Somerville), which dominated the road, but Percy moved his cannon to the front and dispersed them with his last rounds of ammunition. A large militia force arrived from Salem and Marblehead. They might have cut off Percy's route to Charlestown, but these men halted on nearby Winter Hill and allowed the British to escape. Some accused the commander of this force, Colonel Timothy Pickering, of permitting the troops to pass because he still hoped to avoid war by preventing a total defeat of the regulars. Pickering later claimed that he had stopped on Heath's orders, but Heath denied this. It was nearly dark when Pitcairn's Marines defended a final attack on Percy's rear as they entered Charlestown. The regulars took up strong positions on the hills of Charlestown. Some of them had been without sleep for two days and had marched in 21 hours, eight hours of which had been spent under fire. But now they held high ground protected by heavy guns from HMS Somerset. Gage quickly sent over line companies of two fresh regiments—the 10th and 64th—to occupy the high ground in Charlestown and build fortifications. Although they were begun, the fortifications were never completed and would later be a starting point for the militia works built two months