what was the names of the invading and defending army's at the battle of hastings in 1066

The Battle of Hastings is also known as the Norman Invasion of England.

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http://en.wikipedia.org/wiki/Battle_of_Hastings

The invading army at the Battle of Hastings in 1066 was led by William the Conqueror, Duke of Normandy. The defending army was led by King Harold II of England.