The Last Days of Patton. According to the book, he went through a fairly loopy phase just after the war ended, with some thinking he was building his own private army (mainly comprising Waffen-SS POWs) to take on the USSR, but he seems to have got it back together just before he broke his neck in a car crash. Sadly this deprived the world of what would have been the most interesting memoirs of any soldier, but "War As I Knew It", some of his diary entries and other scribblings, is well worth a read.