During the Siege of Port Hudson, which lasted from April 27 to July 9, 1863, Augur commanded the First Division in the XIX Corps of Major General Bank's Army of the Gulf. Banks had replaced Butler as the Army's commander in December, 1862. Augur's First Division acted as the left wing of Bank's army throughout the siege. Augur was brevetted first to Brigadier General in the United States Army on March 13, 1865, for his meritorious service during the Post Hudson Campaign and then, on the same date, brevetted to Major General for his service during the war.