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Kingdoms is the Expansion for Medieval 2 Total war and adds 4 new campaigns,Britannica,Crusades,Teutonic and Aztec, While it does not add anything to the normal Medieval 2 Total war there is a retrofit mod furthermore most mods now require Kingdoms to install.
A major change from Medieval 2 to Medieval 2: kingdoms is that castles and fortresses become much more important, this is historically accurate as land was ruled from the castles and the majority of battles in the middle ages where sieges so no complaints there.
On to the new campaigns:
In The Britannica campaign there is a more in depth campaign of England, Iam willing to bet most people who started a game as England in Medieval 2 spent little time before conquering the entire Island, now however you get to play on a bigger map of England whit the addition of the Irish,Norse, Welsh and after a while the Rebelling Barons alliance you will have a much harder and more enjoyable time conquering all of the British isles.
The Aztec campaign is interesting because the Aztecs and most of the other middle american cultures do not have horses and thus cant chase fleeing units down, their colourful costumes are truly a change from the suits of armour and padded leather from the European armies, The Spanish whit their superior technology,firearms,armour and horses can handle a much larger number of Aztec ( or any other similar culture's) warriors which is good because they will often be outnumbered
The Teutonic campaign deals whit the teutonic order and their crusade against the pagans of northern Europe, the mangonel a new siege engine is an interesting piece of equipment and as far as I have seen the tactics also differ a bit from the regular Medieval 2
and Last but not Least the Crusades campaign gives a more detailed middle east map, you can either try and keep the Crusader kingdoms the Principality of Antioch or the Kingdom of Jerusalem in power or you can try and be like Saladin (Salah ad-Din) and unite Egypt and Byzantium to crush the marauding Crusaders.
The Kingdoms expansion provide a useful change of pace from the regular medieval 2 and open the way for many mods.
Medieval II: Total War Kingdoms features 4 brand new campaigns, including an opportunity to more fully explore The New World that was unlocked toward the end of Medieval II. In the Americas campaign, players can retrace the steps of Hernán Cortés in 1519, as he seeks to explore and conquer The New World. Players can earn the support of Spain and explore the mystery and riches of the New World, or take control of the Aztec or Native American factions and call on the Gods and the bravery of vast armies to see off this new threat.