According to another prisoner's account, Allen wandered off after learning of his son's death. He was arrested for violating his parole, and placed in solitary confinement. There Allen remained while Vermont declared independence, and John Burgoyne's campaign for the Hudson River met a stumbling block near Bennington in August 1777. On 3 May, 1778, he was transferred to Staten Island. Allen was admitted to General John Campbell's quarters, where he was invited to eat and drink with the general and several other British field officers. He stayed there for two days and was treated politely. On the third day Allen was exchanged for Colonel Archibald Campbell, who was conducted to the exchange by Colonel Elias Boudinot, the American commissary general of prisoners appointed by General George Washington. Following the exchange, Allen reported to Washington at Valley Forge. On 14 May, he was breveted a colonel in the Continental Army in "reward of his fortitude, firmness and zeal in the cause of his country, manifested during his long and cruel captivity, as well as on former occasions," and given military pay of $75 per month. The brevet rank, however, meant that there was no active role, until called, for Allen. Allen's services were never requested, and eventually the payments stopped.