The Famous Battle of Tours started because Aqutaine wanted freedom from its Frankish Christian King, so it was willing to get help from the Muslims of Spain, though the debt would have increased Islam's spread. We don't know how the effects of today will change tomorrow.
However, we do know that in this story, France and Sweden have slandered the Empire, that England fears Tanya and thinks her a mastermind of espionage, and that Tanya rightly feared a total war between nations out of fear and envy. Even in the last two chapters, the US was preparing for a fight. A world war is coming to Tanya, though she wants to go back to the rear. Her army needs her bold words and will only place her in the front.