The Marshall campaign planned by the US involved attacks on seven islands, bypassing many more. Operation Flintlock had nine phases, the main phase being the capture of Kwajalein and Majuro Atolls, a second phase, Operation Catchpole, being the capture of Eniwetok, and further phases being the capture of remaining islands. Bombardment by the Seventh Air Force, and a carrier air attack on 4 Dec. 1943, followed by additional attacks in Jan. 1944, destroyed all Japanese aircraft. The 4th Marine Division—under Major General Harry Schmidt—was assigned to Roi-Namur, and the Army's 7th Infantry Division—under Major General Charles H. Corlett—would make the assault on Kwajalein.