The English had been materially assisted by one of Magaw's officers, William Demont, who on November 2 had deserted and furnished Howe with detailed plans of the American fortifications and troop placements. Official American casualties included 53 dead and 96 wounded in addition to the rest of the garrison taken prisoner. The British and Hessian troops suffered 132 dead and 374 wounded. American prisoners were later marched through the streets of New York City, facing the jeering and mockery of the city's large Loyalist population. Most of the prisoners were interned in British ships in New York harbor, where over 2,000 died of disease, cold, or starvation in the bitter winter. Approximately 800 survived to be released in a prisoner exchange the following year.