On the slopes of Mt. Silay lies Patag, the site of Imperial Japan's last stand in Negros during World War II. In 1945, U.S. military forces landed in the island. The occupying forces of the Nagano Detachment of the Imperial Japanese Army retreated to Silay and proceeded up Mt. Silay to Patag. There, they established a defensive position. Military forces of the Philippine Commonwealth and soldiers of the U.S. 40th Infantry Division proceeded up the slopes of Mt. Silay with help from Filipino soldiers of the 7th, 72nd and 75th Infantry Division of the Philippine Commonwealth Army and Negrense guerrilla fighters and defeated the Japanese defenders. Today, the site is marked by a monument dedicated to the efforts which led to the liberation of the island of Negros.