article_snippet.sent: During one meeting in which One former Syrian rebel who became an ISIS regional commander dared to disagree with fellow commanders at an ISIS meeting, Hamza Hamza was placed under arrest on the orders of a masked man who had sat silently and almost unnoticed at the side of the room, listening and taking notes.
article_snippet.sent: Although the enigmatic commander's real name was never revealed to Hamza, Hamza said that Hamza later discovered that Hamza had been an intelligence officer for Hussein's Iraqi Army before joining ISIS.
article_snippet.sent: The same went for the other ISIS commanders Hamza met, who either used code names or no names at all in the hope of concealing the other ISIS commanders Hamza past as members of Hussein's Iraqi Army.
article_snippet.sent: As well as the other ISIS commanders Hamza extensive military expertise, another key element of the other ISIS commanders