Board Thread:Suggestions forum/@comment-25981649-20170810161238/@comment-26122855-20170815220459

While Isengard was a powerful military state, it was also a very young one, barely lasting the extent of two books (which took place over the span of just a few months) Isengard, though ransacking and slaughtering large swaths of land, wouldn't have many semi-permanent structures such as forts. Simply because they wouldn't have had the time to contsruct them.

Take the German blitzkrieg for instance, moves hard and fast, that's mainly what isengard did because they were trying to reach specific objectives. They weren't stopped along the way to construct bases, they were pumping out an army and sending it to waylay Rohan.