Had there been delays or a shift in schedule of events so that the Persians and Romans had enough time to recover from their war, how much would the Caliphate be blunted in their conquests? Would they shift more of their energy into the South (and perhaps East)?
How long would it even take for each empire to recover?
Would the Caliphate even attempt outright war if each empire was at pre-war strength?
How long would it even take for each empire to recover?
Would the Caliphate even attempt outright war if each empire was at pre-war strength?