Same issue under Steam. Too lazy to try any fixes, it only takes a couple seconds to restart and works for about half an hour so I can wait for the patch.

Good luck and hope you guys figure it out soon.

The entire campaign is meant to be a Space Marine focused campaign after their insertion, and follows the 40k lore amazingly close. The battle really was a lost cause until the Space Marines dropped in to help the local troops fight off the hordes, and to fight effectively you need to mix and match ...