Factorio Forums

Artillery turrets target enemy Spidertrons. Since Spidertron is immune to artillery fire, the turret will continue to shoot at the Spidertron until it runs out of ammo. This is unlike other mobile enemy units, such as units, cars, and characters, which the artillery turret doesn't target.

Thanks for the report however I don't think we're going to do anything about this. I recommend anyone who's doing PvP to just disable spidertrons as they have zero balance in regard to PvP.