Fortreses or Fortresses: How To spell?
The word Fortreses is misspelled against Fortresses, which is plural of "Fortress"
Fortresses has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings fortre & es which should not be misspelled with single 'S'
Wrong Spelling:  fortre-s-es  Correct Spelling:  fortre-ss-es 
Find more incorrect spellings of Fortresses to spell right way.