This is an exquisite system that is only pulled off by the game's great AI system. Your troops rarely suffer from that tragic condition found in many RTS games of running in circles, doing the chicken dance in front of the enemy. Instead they always seek the best cover possible, diving to the ground automatically if they get shot at too much, causing them to be 'pinned'. This whole process allows for a far more realistic, fulfilling war experience where you really feel you are commanding an intelligent, well-trained, military unit.