11. While I can't be certain, it seems after the ammo has completely run out it will recharge after a duration, my brother had this happen, I personally wonder if they will only reload at this point if you have wood and perhaps he looted some to recharge their ammo. I have yet to fully test this out. The one time it happened to me, my archers were unable to fire the entire rest of the fight. Since I'm Elvish, this may be because I don't get wood looting corpses and never bring spirits to a fight.
12. This is each individual units HP. The first number is for the whole group.
Sorry these are the only two I can offer any help with but it's pretty tough to find info out about this game, chat is never active enough.