WAY TO MANY ROOKS ON OUTPOST

WHY HAVE I JUST KILLED 5 ROOKS IN A SINGLE GAME AND I STILL GET OVERUN BY 4 MORE, WHAT THE ACTUALLY HELL IS THAT, PLEASE LIMIT THE ROOKS HOLY I LOST 40K WORTH OF LOOT TO A ROOK SITTING WITH A SHOTGUN IN PINWHEELLL!!!!!!!!!!!!!!!!!!!!!!!!!! PLEASE BUNGIE HOW IS THIS FUN????!?!?!?!?!?