To make sure he'd win his sure slam dunk of a case, Irving sued Lipstadt and her publisher in the United Kingdom. There, unlike in the U.S., in libel cases the burden of proof lies with the accused. This was great for Irving, whose strong suit was never facts, or even basic logic. But this turned out to be his biggest mistake -- aside from denying the Holocaust ever happened, of course. Assembling a dream team of historians, Lipstadt set about ruthlessly dismantling Irving in court. After they got Richard Evans, professor of modern history at Cambridge University, to serve as their lead witness, he and a team of graduate students spent two years poring over everything that Irving had ever written. At trial, they demonstrated that Irving had knowingly used falsified documents as sources, misattributed quotes, and willfully interpreted euphemisms for extermination (a common component of the orders issued by the Nazi high command) at face value.
Meanwhile, despite promising to tear Evans "to shreds" on the stand, Irving quickly reduced his tactic personal attacks and ad hominem arguments, which works a lot better on the internet than in a courtroom. Sensing that he was about to lose, Irving tried to settle with the publisher. In exchange for being dropped from the suit, all they would have to do was remove the book from sale, donate a sum of money to a charity run by Irving, and testify against Lipstadt. Oddly, they didn't budge. Irving then made the same offer to Lipstadt. It's said that on quiet nights, you can still hear her lawyers laughing.
With his loss, Irving became liable for all court costs and was eventually driven into bankruptcy. It wasn't as if he had much coming in the way of residuals either; the trial had also brought a wealth of focus back onto his other books and, well, it wasn't good. As much as he loves to, even David Irving now cannot deny that it is an established legal fact that he is a Holocaust-denying, Nazi-supporting, racist idiot.