Gerard Butler says there were an “insane” number of injuries when filming his fan-favorite action hit 300 . The Zack Snyder film from 2006 — which marked Butler’s breakout role, playing the fearsome Spartan King Leonidas — was apparently quite war zone on set.

Zack Snyder’s “300” grossed more than $450 million by the end of its theatrical run, but according to star Gerard Butler, that box office success wasn’t without a few casualties. While speaking with People,

Gerard Butler recalls the difficulties of filming 300 and how many of his co-stars were being taken to the hospital due to injuries.