You can't use your seargeant with a flag a your aim point for your own artillery bombardment. We've been firing slings into the enemy in "melee" with our own troops for at least 2500 years. Yeh it's messy and morale gets affected but sometimes for even the most humane armies it makes sense. Read up on the battle of kapyong. Not quite firing on them selves intentionally, but almost. Lack of "point on the ground" targeting is a sub-issue of this.