Benedict Arnold

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…deeply into his own purse to pay expenses, he was never reimbursed for most of them, nor honored by Congress for his victories. Crestfallen and melancholy, he was approached by a smooth-spoken spy for the British. Arnold made the worst decision of his life...he switched sides. He died in England, at age 60, and was buried in a "jumbled, unmarked grave" without military honor or notice. His last years were full of misery and bitterness.