[Raymond Luxury Yacht]

kmmontandon;172119 said:

I'd really think that Moranth munitions would render traditional fortifications obsolete in a way that cannon really didn't until about the 17th century - but then we can't be sure how effective those munitions are against fortifications when they aren't used in a heavy concentration.

It seems that the widespread use of munitions is a fairly recent development. It'll take a little while for everyone to catch on that traditional fortifications or now useless. The events in the books should help teach them though.