 Beauregard remained in command of the Army of Mississippi and led it back to Corinth.In late April and May, the Union armies, under Halleck advanced slowly toward Corinth and took it in the Siege of Corinth, while an amphibious force on the Mississippi River destroyed the Confederate River Defense Fleet and captured Memphis, Tennessee.Halleck was promoted to be general in chief of all the Union armies and with his departure to the East, Grant was restored to command.