First of all my Infantry training was 30 odd years ago, I'm sure tactics have changed. Also, military tactics don't fit the scenario' s that would normally face civilian's in survival situations. So forgive me. We were basically trained in Advanced Infantry Training on three basic types of ambushes. Hasty, small unit (6 to 12 men), and "L" shaped ambushes that required about a platoon of 25 to thirty men. A hasty ambush was just that. Your point man saw enemy troops, signalled the squad leader or team leader, and you spread out in a line to receive them after posting flank and rear security. This type ambush was pretty common and not that hard to control. You would also use this type if you were running and needed a little "elbow room" until your support kicked in. (A Retrograde Ambush, the Army NEVER retreats) The "L" type, was a planned ambush utilising your troops as the names implies, in an "L" shape on a trail or known movement point. A machine gun was placed on the short leg of the "L" to fire along the front of the ambush. Claymore mines were placed on both ends of the long leg of the "L" and also in the middle. You placed security also, of course. The Patrol Leader would give the order to open up when notified by radio (break squelch only, no voice) by blowing a claymore or ordering the machinegunner to fire. These type ambushes take a lot of coordination and are difficult to control. If YOU got ambushed, you were trained to open up with everything you had to establish "fire superiority", once you did , you assaulted the ambush. If you couldn't esatblish fire superiority. you were to "break contact" on your leader's order. "Break Contact" is Army for "Run Like Hell" away from the ambush, taking your wounded along, to a designated "rallying" point. Once there, you went into a perimeter defense. None of these ever work like they read, flexibilty was stressed to the maximum.