In the War of 1812, he was promoted to the rank of post-captain and commanded the USS Ticonderoga in the Battle of Lake Champlain and was awarded a gold medal by the United States Congress in commemoration of the victory.
Text of Congressional Gold Medal resolution: At the close of the war, Cassin commanded the Newport, Rhode Island Station, and after that the Washington Navy Yard for five years.
[2] Cassin was married to Margaretta Abernethy and had thirteen children.
He was buried in Washington, and reinterred in 1907 in Arlington National Cemetery.
[4] Two ships have been named USS Cassin for him, both of which his granddaughter helped launch.