With Japanese, a spear opening is not bad here. You're going to want spears against knights anyway. And if it is forward gold, it gives you a clear blocker. The challenge is you can't really stop Jeanne from getting enough gold to tech up usually because Jean herself is a giant beefcake. 150 HP, easily deals with spears early on, kind of holds it back to buy time.
Mounted samurai do very well against French knights due to their deflective armor.
Onna-Musha are the worst unit Jean d'Arc can encounter; they eviscerate her.
Onna-Musha basically have to be raiding to be better than Arbalétriers. If your only goal is direct fight, Arbalétriers will be better.
Remember: Jean d'Arc doesn't get free melee techs like French.
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