Why do the troops have more than 1 hp, when they either die in one shot or not at all. At least I've never seen a soldier survive a hit, even from a grenade 10m away when they're in a trench.
If you have 1 free die: roll if you have < 400 points. 2 free: < 500. 3 free: < 700. 4 free: < 900. 5 free: < 1200. Otherwise take all your options and bank that ****.