Actually, he was known as "Nelson" due to having the same body bits missing as the Admiral. He lost an arm, but prior to that he lost the hand on that arm in a previous wound. He knew his hand was gangrenous but the surgeon refused to remove it. So he chewed two of his own fingers off!
Despite his injuries, he says that he had a rather enjoyable war!
Evelyn Waugh used him as the model for his character Brigadier Ritchie-Hook in the Sword of Honour trilogy.