Since there were no U.S. formations stationed in Huế, relief forces had to move up from Phu Bai Combat Base, eight kilometers to the southeast. In a misty drizzle, U.S. Marines of the 1st Marine Division and soldiers of the 1st ARVN Division and Marine Corps cleared the city street by street and house by house, a deadly and destructive form of urban combat that the U.S. military had not engaged in since the Battle of Seoul during the Korean War, and for which neither side were trained. Because of poor weather conditions, logistics problems and the historical and cultural significance of the city, American forces did not immediately apply air and artillery strikes as widely as they had in other cities.