Focus on clearing "loners" and Snatchers in the mines to reach the ore transporter.
The end of Act 4 features a massive Swarmak battle. Focus fire on its glowing blisters and be prepared for a long, multi-stage fight. Gears.of.War.4.part04.rar
If you are looking for a guide for of the campaign (which often corresponds to "Part 4" in video series), here are the key strategies: Focus on clearing "loners" and Snatchers in the