New Hearts of Iron 4 expansion Thunder at our Gates has just arrived, and it's all about stepping into the heart of command. The new 'theater pack' continues to grow the now decade-old WW2 game (happy tenth birthday, HoI 4, you've now lasted 60% longer than the conflict you're based on) across three nations that don't often get enough recognition. Become the last bastion against Japanese forces with Australia, carve out an empire as Siam, or determine whether Indonesia should push for independence. Add in the introduction of military HQs and ship captains, and your skills as a leader will be put to the test.