Once the Marines landed, they quickly found that the volcanic ash on the island was difficult to move in, got vehicles stuck, and slowed them down considerably. Marine Corps amtracs and medium tanks seen blasted by Japanese artillery after being bogged down in the soft black volcanic ash of Iwo Jima.
Anarchy means there are absolutely no laws and you can go around and do whatever you want. This means that murder and robbery is bound to happen and there would be no safety.