Guadalcanal campaign
By December, the tired 1st Marine Division was brought back for a rest, and over the next month the U.S. XIV Corps took over operations on the island. This corps consisted of the 2nd Marine Division and the U.S. Army's 25th Infantry and Americal Divisions. U.S. Army Major General Alexander Patch replaced Vandegrift as commander of Allied forces on Guadalcanal. By January this was over 50,000 men.