Episode 5 Chapter 4 - Another easy one. Just load up The Cauldron on Heroic, either solo or 2-player co-op (so you still have Mantis vehicles instead of hogs), and blast everything in sight at the generators. You can hop out of your Mantis at the choke points to slow enemies down, but it really isn't necessary. I know this isn't a detailed walkthrough but it's really not necessary. However, I did put up a quick video this morning for it. Cheers!