Book

 1 5| cross a river, not having a bridge, have diverted it, and having
 2 5| depart, they should throw a bridge across and fortify it, and
 3 5|   as soon as he thought the bridge had been completed, turned
 4 5|     he then throws a wooden bridge, planned for such a result,
 5 7|  entered by means of a draw bridge. The fortress was divided
 6 7|     master of (protect) the bridge in its own area, arranging
 7 7|     there is a ditch with a bridge over it from the revet to
 8 7|   half of it comes over the bridge, and the other half outside.
 9 7| When they want to close the bridge from the outside, therefore,
10 7|   to drop, which closes the bridge when it is lowered, and