Julius Caesar Gallic War 8.13

In the mean time daily skirmishes take place continually in view of both camps; these were fought at the ford and pass of the morass. In one of these contests the Germans, whom Caesar had brought over the Rhine , to fight, intermixed with the horse, having resolutely crossed the marsh, and slain the few who made resistance, and boldly pursued the rest, so terrified them, that not only those who were attacked hand to hand, or wounded at a distance, but even those who were stationed at a greater distance to support them, fled disgracefully; and being often beaten from the rising grounds, did not stop till they had retired into their camp, or some, impelled by fear, had fled further. Their danger threw their whole army into such confusion, that it was difficult to judge whether they were more insolent after a slight advantage or more dejected by a trifling calamity.