Before dawn on November 16, the British and Hessian troops moved out. Knyphausen and his troops were ferried across the Harlem River on flatboats and landed on Manhattan. The flatboatmen then turned down the river to ferry Mathew's troops across the river. However, due to the tide, they were unable to get close enough to the shore to bring the British troops across. Thus, Knyphausen's troops were forced to halt their advance and wait until Mathew could cross. Around 7:00 a.m., Hessian guns opened fire on the American battery on Laurel Hill, and the British frigate began to fire at the American entrenchments. Also, south of the Fort, Percy had his artillery open fire on the fort itself. Percy's artillery aimed at Magaw's guns which had damaged the British ships several weeks before.