Following the entrance of the People's Republic of China into the war in late November 1950, Brown and his squadron were dispatched to the Chosin Reservoir, where an intense campaign was being fought between the People's Volunteer Army and the US X Corps. Approximately 100,000 Chinese troops had surrounded 15,000 U.S. troops, and Brown and other pilots on "Leyte" flew dozens of close air support missions every day to prevent the Chinese from overrunning the U.S. troops.