My understanding is that Jentz is one of the best armor scholars around. I have read that more then once. I believe that the 76mm armed Shermans did not see tank on tank combat until Operation Cobra a few weeks or so after the invasion but that was a breakout operation designed to breakout of the hedgerow region and was postponed for a couple of weeks due to weather restricting air support. Also considering that most if not all panzer divisions were held back and didn't reach the region in strength until the first week of July makes sense that that was to be their first exposure to combat. Make no mistake they did land on the beaches of Normandy. Maybe not in the first of second or 10 wave but that doesn't mean that they didn't land there. Like I said, from what I have read only 100 or so were on the invasion ships during the landing.
So what Jentz books are you talking about? What pages as well since Jentz doesn't do indexes. (WTF)
I have his 2 on the tigers, one on the Panther, plus the speilberger books on the Panzer 3, 4 and Panther.
The 76MM M4A1 Sherman first saw combat in Europe on July 25 1944 on the second day of the Cobra Offensive. They sat in warehouses in England unwanted because the US Army didnt consider the Panther a real threat until after D-Day. Page 16 of M4 (76MM) Sherman Medium Tank 1943-65 by Zaloga.
Acks Page number is from Armored Thunderbolt, also by Zaloga.