Source: Steam
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Updates to Medieval II: Total War have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Medieval II: Total War
-Soft-locks in Multiplayer Lobby no-longer occur
-Fixed Random hangs after loading Campaign save game
-Fixed Auto-resolve Siege battle hangs
-Units do not clump together when told to complete a 180 degree turn
-Enemy AI army formations in bridge battles now allow their own artillery to fire
-Improved diplomacy mechanic - AI Factions now stick with alliances and/or attack 'more intelligently'