A small crowd gathered on the Battery Park City esplanade near North Cove Monday morning to watch the U.S.S. New York chug up the Hudson River. The warship, fashioned with 7½ tons of steel from the collapsed World Trade Center, paused near ground zero around 8 a.m. Monday and fired a 21-gun salute. First responders, 9/11 victims’ family members, military veterans and local residents and workers then watched as the ship continued up the river to Pier 88, where it will remain docked through the middle of next week before heading for the deeper waters of the Persian Gulf.