Site of Caesar's battlefield of 55BC discovered in the Netherlands

[Robert Vermaat]

According to archaeoligists of Amsterdam Free University, they have discovered the site of Caesar's battlefield / massacre of the Tencteri and Usipetes in the southern Netherlands. More info.

Nice article, but two questions arise:
1 - the map (which only wants to open in a separate page for some reason) shows the march of the Germanic tribes across the then far wider Rhine (now the narrow Old Rhine) to the Dordrecht area. then the tribes turn sharp east, straight into Caesar's forces, but apparently crossing the point where the Maas meet the river that is today called the Waal. But (here comes the question) why would the tribes cross that point and later be trapped in the same spot? It would seem far more logical that they did not march as far West as shown here, but crossed the Rhine but once and far more to the East, probably even in modern Germany.
I've added a crude adjustment to the Original map to show my hypothesis.

2- The claim that Caesar mentioned the destruction of the tribe 'to keep survivors out of the books' seems to me to be over the top. Why would Caesar need to keep something like that a secret when all his men would have known anyway? Ceasar could do as he wished in Gaul. Whether for his own hunger for power [sic] or the glory of Rome.