Company of Heroes 2, a World War II-themed real-time strategy game, and its independent single-player expansion Ardennes Assault are free on Steam.
You can get the game and expansion for free by adding “Company of Heroes 2, Company of Heroes 2 – Ardennes Assault” to your account on Steam. If you add it to the library before 8:00 p.m. on May 31, you’ll keep it.