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Although their have been many threads on the subject, i dont think that the early phases have been touched si extensivly.
So WI the parthians rather than revolt remained content with their autonomy. Lets say Yazdegered makes more concessions and so they do not revolt. At the same time his councilers manage to secure for him the support of the great northern families. Then with internal unrest quelled when the arabs do raid sassanid territory could the sassanids if yazdegered doesnt delay sending the army rather he sends the entire might of the sassanid army backed by the great northern and parthian hosts and a semi unified empire could he beat them back?