[2] Following the fall of Montreal, Livingston was authorized by Montgomery on November 20 to raise a regiment to assist in the coming assault on Quebec City.

The diversions did not work, and the battle ended disastrously for the Americans, with Montgomery killed, Arnold wounded, and about 400 men taken prisoner.

The remnants of the army, then under Arnold's command, besieged the city until May 1776, when British reinforcements began arriving, forcing the Americans into a panicked retreat.

On the night of June 7, 1776, Livingston's regiment was part of a force of about 2,000 under Brigadier General William Thompson that returned from Sorel to Trois-Rivières to drive off what they believed to be 300 to 600 British troops from Quebec.

Following the army's return to Ticonderoga, the regiment was assigned garrison duty in upstate New York, primarily the Mohawk and Schoharie valleys, so that it could be reorganized.

Most notably, Colonel Livingston was in command of Verplanck's Point on the Hudson River in September 1780, and played a crucial role in the unmasking of Benedict Arnold's treachery.

Since the ship was driven off, André was forced to attempt travel by land to New York, when he was captured not far from the British lines near Tarrytown with incriminating papers in his possession.