Quote Originally Posted by Caledonian Rhyfelwyr
The ridge probably meant all your xbows had a clear shot against the army. Otherwise, any men beyond the second row in a unit will often end up firing at a 45 degree angle, and with crossbows those shots do no damage. Thats why hills are especially valuable to xbows.
An archer's line-of-sight isn't blocked by members of his own unit. Other friendly units, yes, but not his own.

A unit of archers only four wide and 28 deep fires just as well as one 56 wide and two deep.

Utterly unrealistic, but true, and useful to know.