The Korean War broke out on June 25, 1950, and Captain Schrier was sent to Korea with the 1st Provisional Marine Brigade in July. He was awarded the Bronze Star Medal for his actions while serving as the brigade adjutant in August and September during the Battle of Pusan Perimeter in South Korea. He was assigned next as the company commander of I Company, 3rd Battalion, 5th Marines, 1st Marine Division. During the Battle of Chosin Reservoir in North Korea, he was wounded in the neck on December 1, during an all-night hill fight at Hill 1520 with Chinese Communist troops. He was evacuated to Japan.