...f retreat. At my suggestion, by collecting boats and using the city wharves for flooring and car-wheels for anchors, Colonel Frobel constructed a pontoon-bridge, about half a mile in length, from Hutchinson's Island over the river, and on December 20th the city was evacuated. The artillery, baggage wagons, and all the troops, except the permanent garrisons of the forts below, passed over the bridge, the militi...