Footage of U.S. Marines and the Afghan national army occupying the Khan Nechion castle in south Helmand Province. Scenes include a firefight between Marine and Afghan army soldiers against insurgents, various views of the castle, a Marine Corps bulldozer that hit an improvised explosive device (IED) and interviews with Marines discussing entering the Khan Nechion castle and surviving a IED explosi More..on. The castle is an ancient fortress built by Alexander the Great.   Marine Corps video