Core · Unit · Rules

At the start of a CQB, each non-Sited Unit with First Strike inflicts X Small Arms hits on the enemy Squads, distributed freely. If both players have First Strike Units involved, the player without the Initiative distributes their hits first. DF saves are then attempted simultaneously.

Source: Dropzone Commander Rulebook 3.02 · 3.02 · p. 45 · unit-special-rules