The Battle of Forts Jackson and St. Philip (April 18–28, 1862) was the decisive battle for possession of New Orleans in the American Civil War. The two Confederate forts on the Mississippi River south of the city were attacked by a Union Navy fleet. As long as the forts could keep the Federal forces from moving on the city, it was safe, but if they fell or were bypassed, there were no fall-back positions to impede the Union advance.