Roman general Julius Caesar, unexpectedly, lost many of his ships when he invaded Britain. Why?

gtho4

The ships didn't make it through a storm. The next day, early in the morning, he sent both foot-soldiers and horse in three divisions on an expedition to pursue those who had fled. These having advanced a little way, when already the rear [of the enemy] was in sight, some horse came to Caesar from Quintus Atrius, to report that the preceding night, a very great storm having arisen, almost all the ships were dashed to pieces and cast upon the shore, because neither the anchors and cables could resist, nor could the sailors and pilots sustain the violence of the storm; and thus great damage was received by that collision of the ships. http://www.mytimemachine.co.uk/caesarinvades.htm It happened that night to be full moon, which usually occasions very high tides in that ocean; and that circumstance was unknown to our men. Thus, at the same time, the tide began to fill the ships of war which Caesar had provided to convey over his army, and which he had drawn up on the strand; and the storm began to dash the ships of burden which were riding at anchor against each other; nor was any means afforded our men of either managing them or of rendering any service. A great many ships having been wrecked, inasmuch as the rest, having lost their cables, anchors, and other tackling, were unfit for sailing, a great confusion, as would necessarily happen, arose throughout the army; for there were no other ships in which they could be conveyed back, and all things which are of service in repairing vessels were wanting, and, corn for the winter had not been provided in those places, because it was understood by all that they would certainly winter in Gaul. http://mcadams.posc.mu.edu/txt/ah/Caesar/CaesarGal04.html Mar 03 10, 9:26 PM