Each To Hit roll result of 1 inflicts one hit on the closest friendly unit in the firing unit's front arc that is within range. If there are no eligible friendly units, then the attack misses.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Each To Hit roll result of 1 inflicts one hit on the closest friendly unit in the firing unit's front arc that is within range. If there are no eligible friendly units, then the attack misses.