Ack-Ack, I've read that book as well, but I have several reservations against the description of that particular engagement. First of all the Tiger's rear armor is described as "thin", when in fact it was as thick as the side armor at 80 mm. I've asked around for some form of confirmation of this engagement, but have found little or nothing to support it. While I don't really doubt the engagement happened I think it is far more likely the M8 ambushed a PzKpfW IV rather than a Tiger. A fact lost on many is that in France the Americans and British often referred to all German tanks as "Tigers".
If you have more substantial information on the engagement I would love to read/see it. At least if I were that M8 commander (and if the battle conditions allowed for it) I'd take a picture of that kill!