Halo Wars Title Updates
From Halopedia, the Halo wiki
Throughout its lifespan, Halo Wars was updated with a number of Title Updates to fix game balance issues, patch bugs and make other quality-of-life improvements. The updates were released as free parts of the game's downloadable content throughout 2009 and 2010. Title Updates 1-4 were developed and released by Robot Entertainment due to the closure of Halo Wars developers Ensemble Studios, while Update 5 was developed by 343 Industries.
Title Update 2
Title Update 3
Title Update 3 was released on July 17, 2009.
Title Update 4
Title Update 4 was released on December 18, 2009.
While not listed in the official patch notes above, TU4 also brought additional changes to the Halo Wars multiplayer rank system.
Title Update 5
Title Update 5 was developed by 343 Industries following the the decision to close halowars.com and fold its services into Halo Waypoint. The patch was originally intended to be released on December 15, 2010, though was delayed and later released on March 23, 2011.