It's a long story, but mainly he was just beaten in battle. More details can be found at http://en.wikipedia...ki/Wars_of_the_Roses#Henry_VI and the references it uses. Note that if you are going to use wikipedia then it's best to look at its sources too!
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I got a piece of history homework that i have to write about henry viii court and decied to base it on when Henry found out that cathrine was cheating on him but i need more infomation to write it. Thanks