During the battle of Seoul on September 24, Lieutenant Colonel Roise, directing the assault companies in smashing the enemy's main line of resistance outside the city, was wounded when his forward observation post was subjected to a mortar barrage. He refused medical evacuation and directed the evacuation of other wounded Marines. Roise then briefed his executive officer in the situation before receiving medical treatment. Still refusing evacuation, he continued to direct his Marines in the capture of the city. For his actions during the Inchon-Seoul campaign, Lieutenant Colonel Roise was awarded his first Navy Cross.