So attack priority is based on two factors: ATP and OTP. ATP is used by default, with OTP used as a back up if other units are close. Higher # = Higher priority ##Protoss## Archon 20 0 Carrier 20 0 Colossus 20 0 Dark Templar 20 0 High Templar 20 0 Immortal 20 0 Interceptor 20 0 Mothership 20 0 Observer 20 0 Phoenix 20 0 Probe 20 10 Sentry 20 0 Stalker 20 0 Void Ray 20 0 Warp Prism 20 0 (identical for both modes) Zealot 20 0 Force Field 0 Forge 11 Fleet Beacon 11 Gateway 11 Cybernetics 11 Dark Shrine 11 Nexus 11 Photon Cannon20 Pylon 11 Robotics Bay 11 Robotics Fac 11 Stargate 11 Archives 11 Twilight Council 11 Warpgate 11 ##Terran Auto-Turret 20 0 Banshee 20 0 Battlecruiser20 0 Ghost 20 0 Hellion 20 0 Marauder 20 0 Marine 20 0 Medivac 20 0 MULE 20 10 Point Defense20 0 Raven 20 0 Reaper 20 0 SCV 20 10 Siege Tank 20 0 (both modes) Thor 20 0 Viking 20 0 (both modes) Armory 11 Barracks 11 Bunker 19 Command Center11 Engineering 11 Factory 11 Fusion Core 11 GhostAcademy11 MissileTurret19 OC 11 Planetary 20 Reactor 11 Starport 11 Supply Depot11 Tech Lab 11