Very Underrated Part of Fate/Grand Order: At the start of the France chapter, which takes place during the Hundred Years’ War (France vs England), You and Mashu come across some soldiers. Mashu greets them in English and asks for directions towards the nearest settlement. They were French soldiers. Mashu, an enigmatic woman, spoke in English to French soldiers during the Hundred Years’ War.
That’s why you gotta fight a bunch of French soldiers.