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Two of the most important battles in Muslim expansion were the Battles of Yarmouk and al-Qādisiyyah. What if the opponents had won these battles instead?
A: Romans annihilate the Rashidun at Yarmouk, including killing all major commanders such as al-Walid.
B: The Sassanians destroy the Rashidun force at al-Qādisiyyah, killing all major commanders including Caliph Umar.
C: Both A and B happen.
I am most interested in B since it is not discussed often, but I thought the discussion could be enlarged if other possibilities regarding early Islam were added as well.