Space Combat

Official rule text

77.5 STEP 2—ASSIGN HITS: The player whose units have been targeted by “Space Cannon” must choose and destroy one of their ships in the active system for each hit result produced against their units. a Players other than the active player must target the active player’s units. b If the active player is using the “Space Cannon” ability of their units, they choose a player who has ships in the active system. That player must choose and destroy one of their ships in the active system for each hit the space cannon roll produced.