The Red Beach forces, made up of the Regimental Combat Team 5, which included the 3rd Battalion of the Republic of Korea Marine Corps (ROKMC), used ladders to scale the sea walls. Lieutenant Colonel Raymond L. Murray, serving as Commanding Officer of the 5th Marines, had the mission of seizing an area long and deep, extending from Cemetery Hill (northern) at the top down to the Inner Tidal Basin (near Tidal Basin at the bottom) and including the promontory in the middle called Observatory Hill. (See Map) The 1st Battalion, 5th Marines would be on the left, against Cemetery Hill and northern half of Observatory Hill. The 2nd Battalion, 5th Marines would take the southern half of Observatory Hill and Inner Basin.