Sorry for my engish
Grenades are needed for a fight with campers, that they were not used in infighting, detonation of grenade must be "slow". A grenade falls, lies a few seconds, smokes, sparkles, hisses, and then bursts, thus, soldiers will have possibility to escape, but they will have to abandon shelter.
It is as an example possible to look singleplayer of 1866
Grenades are needed for a fight with campers, that they were not used in infighting, detonation of grenade must be "slow". A grenade falls, lies a few seconds, smokes, sparkles, hisses, and then bursts, thus, soldiers will have possibility to escape, but they will have to abandon shelter.
It is as an example possible to look singleplayer of 1866