as "missing" in the official casualty return, 170 were captured, of whom some were wounded. The remaining 46 may have died in the massacre at Battery No. 2, since no Americans in the battery survived to report their comrades' fate. The British official casualty return stated 115 killed, 178 wounded and 316 missing. The Americans took 382 prisoners (11 officers and 371 enlisted men), indicating that 66 of the British troops marked down as "killed" in the official casualty report were in fact captured. The thickly wooded nature of the battlefield may have led the compilers of the casualty return to assume that these men were lying dead among the trees and undergrowth. This gives a revised British loss of 49 killed, 178 wounded and 382 captured. Of the 11 officers who were taken prisoner, 2 were wounded. End of the siege Unknown to the Americans, Drummond had already decided on 16 September to lift the siege, and had given orders for his artillery to be moved to Fort George as soon as possible. Shortage of draught animals had delayed his departure. It was not until the night of 21 September that the British force finally withdrew to the Chippawa River. In a letter to Sir George Prevost, the British commander-in-chief in North America, Drummond cited the continual heavy rain, illness among his men and lack of camp equipment as his reasons for breaking off the siege. His force was reduced to 2,000 effectives and his camp had the appearance of "a lake in the midst of a thick wood". In the general siege operations from 1 August to 21 September (not including the engagement at Conjocta Creek on 3 August, the capture of the Ohio and the Somers on 12 August, the cannonade from 13 August to the early morning of 15 August, the assault on 15 August or the sortie of 17 September), the American garrison lost 104 killed and 250 wounded. All but 29 of these casualties came from the regular U.S. Army. The number of Americans captured or missing during this period is unknown. The overall British casualty figures for the siege also appear to be unknown. Evacuation In early September, Major General George Izard's division had been ordered to march from Plattsburgh to Sackett's Harbor, where they arrived on 17 September. On 21 September, the American naval squadron on Lake Ontario under Commodore Isaac Chauncey