Book, Par.

1    I,   8| nineteen [Roman, not quite eighteen English] miles a wall, to
2    I,  23|    as he was not more than eighteen miles from Bibracte, by
3   II,   5|    in height, and a trench eighteen feet in breadth. ~
4   IV,  19|    having spent altogether eighteen days beyond the Rhine, and
5   IV,  22|  were in addition to these eighteen ships of burden which were
6   IV,  28| had come into Britain, the eighteen ships, to which reference
7 VIII,   4| had not remained more than eighteen days in winter quarters,