Hi Laura, no, though perhaps Danielle was suggesting the discussion could go in that direction. But this policy, which hardly ever really seems to be followed, can not really help in medieval situations.
In fact, we know in the confusion of policies this policy is even enough to get your criticized, because only modern French people can have a surname with a "de", not medieval ones. Sigh.
It also leads to crazy discussions like ones where people think that William the conqueror and William the Marshall were really named Guillaume.
If we wanted to use that policy, we should use Latin for most western Europeans in the middle ages. That was the official language that was really used and had some amount of standardization.
I would say that policy is an example of how Wikitree makes policies badly, in such a way that they make discussion more complicated and not less.
But coming back to the Battle. I would think this is a category for people seeking historical events, and so the normal terminology used in modern English historical books should be used? (I would find it easier if we used modern French.)
I have NO IDEA what arguments there are to use 19th century English. Perhaps there is a policy about that somewhere too.