I think it would be a nice addition to have some kind of army bufs.
For example something as camouflage level 1, 2 and 3 you can put this buff on your bow, longbow or crossbow.
For the duration of the buff (level 1 = 1 round, level 2 = 2 rounds and level 3 = 3 rounds) this unit is camouflaged and not seen as the weakest target so it will not be targeted by the enemy with weakest target ability.
Think somethings like this would make the battles more interesting
Probably many others have nice ideas for more army buffs...