[64] Pierce remained in command of his brigade during the three-month occupation of the city; while frustrated with the stalling of peace negotiations, he also tried to distance himself from the constant conflict between Scott and the other generals.[65]
Pierce was finally allowed to return to Concord in late December 1847. He was given a hero's welcome in his home state, and submitted his resignation from the Army, which was approved on March 20, 1848. His military exploits elevated his popularity in New Hampshire, but his injuries and subsequent troubles in battle led to accusations of cowardice which would long shadow him. He had demonstrated competence as a general, especially in the initial march from Vera Cruz, but his short tenure and his injury left little for historians to judge his ability as a military commander.[61]
Ulysses S. Grant, who had the opportunity to observe Pierce firsthand during the war, countered the allegations of cowardice in his memoirs, written several years after Pierce's death: "Whatever General Pierce's qualifications may have been for the Presidency, he was a gentleman and a man of courage. 