Isotx today announced a free expansion pack for their new RTS/FPS hybrid, Iron Grip: Warlord. Entitled The Winter Offensive, the expansion will be available starting December 22nd through their webstore. In order to access this free new content, you must own the original game first and then apply the update. Iron Grip: Warlord Winter Offensive will include three new units, one new level, a new soundtrack, and lots of technical changes and bug fixes.