Our guide, Michael in front of one of the caves. Some were built to get men to the action on the other side of the mountain, some were built for cannons, some were built to have spotlights shine on the action to see what was going on. Still others were built to collect water. Over 4K men on that mountain, and no real source of food or fresh water, and in the winter, it was brutal. No wonder men found or dug out caves in the mountainside to take cover.