It was generally felt that after the tremendous loss he suffered in the last of the eleven assaults made by the French that Napoleon could no longer continue the siege. Not only had the numerical loss been enormous in proportion to the strength of the army, but it had fallen upon his best troops. The artillery had suffered terribly, the grenadiers had been almost annihilated, and as the assaults had always been headed by picked regiments, the backbone of the army was gone. It was soon ascertained indeed that Napoleon was sending great convoys of sick, wounded, and stores down the coast, and on the 20th the siege was raised, and the French marched away.