Nice edit, Fea.  I think it does reflect Azarmano better, and also shows a nice note of humility on Inzi's part.
As for Himaran's suggestion, I recall a mini-rp that ran in Gondor a couple years ago where Rimbaud and Estelyn blocked an invasion of Minas Tirith which would have entered through the sewers (The Saving of the Star, I believe?).  It seems as though if it could be plausible in Minas Tirith it could be plausible in Armenelos.  Both are examples of Numenorean city-planning.  

   However there are a few thing that would need to be incorporated: 
1.  They would need a credible source to guide them into and/or through the sewers 
2.  I doubt (highly) the sewers would be unguarded.
Sophia