If you still have not received this early in the game no worries. I would recommend the Brumak fight in Act 1 Chapter 6 Into the Fire on easy so it doesnt give you any problems.
Aside from keeping the brumak in the middle and chipping its health down you only cconcern would be the emergency holes and wretches that pop. Take care of them quickly. Make sure all your units damaged the Brumak and once you Kill it this should pop.