This article is about the Real World
Ironman mode was introduced in Gears of War 4's Rise of the Horde update. It is a separate toggle option that can be added to any of the five difficulty settings. Ironman mode simply means don't die. In Campaign, one death will reset your game to the beginning. In Horde, one failed wave will reset you to wave 1, and COG Tags don't drop when a player dies.