Which units in Starcraft 2 cause friendly fire?

I already know that Siege Tanks do, as can misplaced Psionic Storms, but I was surprised to learn that Colossi and Banelings do not.

Which units can accidentally inflict damage on your own forces?


The only units that actually cause friendly fire from splash damage are:

  • Siege tank shells
  • Psionic storms
  • Widow Mine attacks (except for other widow mines)
  • Raven's Seeker Missiles
  • Ghost's EMP
  • Ghost's Tactical Nuke

Some units that you might expect to cause FF splash damage but in fact don't are:

  • Yamato cannon on BCs (doesn't cause any splash)
  • Planetary Fortresses
  • Hellion/Hellbat attacks
  • Thor attacks
  • Baneling explosions
  • Infestor's fungal growth
  • Ultralisk attacks
  • Mutalisk attacks
  • Colossi attacks
  • Archon attacks

Edit: See this website for more details.

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  • Mutalisks should not be expected to friendly fire, 'cause everyone knows glave wurms are intelligent, cunning and compassionate! :) – Orc JMR Mar 22 '13 at 17:14
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    @OrcJMR: For certain definitions of "compassionate". – Oblivious Sage Mar 22 '13 at 17:18
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    Yamato Cannon does not cause any splash damage. Otherwise a great list. – OrwellHindenberg Mar 22 '13 at 17:32
  • Yes you're correct, I worded the second list's title wrong. The Yamato cannon is basically a mini-nuclear explosion, and the animation for it might make people think it does splash so that's why I included it. I edited the answer, thanks! – Murkantilism Mar 22 '13 at 17:46

Currently the units which can cause friendly fire are Siege Tanks (in siege mode), Psionic Storms, Widow Mines, and Raven's Seeker Missiles.

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    You missed Ghost's EMP & Tactical Nuke. Although in most situations a player would have to either be an idiot or intend to EMP or Nuke themselves, it does happen accidentally. There's a common terran technique where the T will drop a nuke force an enemy retreat & gain a better position, then cancel it before it lands. I can't remember who did it, but I do remember in an SC2 WoL pro game TvP where the terran dropped a nuke to gain a positional advantage, then forgot to cancel and walked his army right underneath it. – Murkantilism Mar 22 '13 at 17:19

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