Neither the strength of the invading army, nor of the garrison had been understood.

When therefore intelligence was received that a place, on the fortifications of which much money and labour had been expended, which was considered as the key to the whole northwestern country, and supposed to contain a garrison nearly equal to the invading army, had been abandoned without a siege; that an immense train of artillery, and all the military stores, had either fallen into the hands of the enemy, or been destroyed; that the army, on its retreat, had been attacked, defeated, and dispersed; astonishment pervaded all ranks of men; and the conduct of the officers was universally condemned.

Congress recalled all the generals of the department, and directed an inquiry into their conduct.
Throughout New England especially, the most bitter aspersions were cast on them and General Schuyler, who, from some unknown cause, had never been viewed with favour in that part of the continent, was involved in the common charge of treachery, to which this accumulation of unlooked-for calamity was generally attributed by the mass of the people.
On the representations of General Washington, the recall of the officers was suspended, until he should be of opinion that the service would not suffer by the measure; and, on a full inquiry afterwards made into their conduct, they were acquitted of all blame.
In a letter of St.Clair to the Commander-in-chief, stating his motives for evacuating Ticonderoga, he represented the strength of his garrison, including nine hundred militia, who would consent to stay but a few days, at only three thousand effective rank and file, many of whom were without bayonets.

The lines required ten thousand to man them properly.

He also affirmed, that his supply of provisions was sufficient for only twenty days, and that the works on the Ticonderoga side were incomplete, with their flanks undefended.