Fort Bute or Manchac Post, named after the then British Prime Minister John Stuart, 3rd Earl of Bute, was established in 1763 at the junction of Iberville River (Bayou Manchac) with the Mississippi River, and remained an important military and trading post in British West Florida until captured by Spanish forces under Luis de Unzaga who built a new fort, Manchak fort, in August of 1775; later, his brother-in-law Bernardo Galvez captured Manchac Fort from English again on September 7, 1779, during what became known as Battle of Fort Bute of the American Revolutionary War. Manchac was raided in February 1778 by American forces under the command of James Willing—see related articles, Continental Marines and USS "Morris". Fort Bute/Manchac Post/Mississippi River at Bayou Manchac is 45 miles from Manchac.