[Marcello]

Of course deep fording was rather unhealthy and while the others vehicles were amphibious some were just barely so.
I suspect that there was an underlying attitude along the lines "even if few percent are lost but the rest get through is worth it" but I cannot prove it. The banks will need preparation and only a few places will be suitable.
The point however is that just blowing up a couple of bridges in front of them will not be a show stopper. Ultimately of course it will come down to engineers bridging assets.