Good war / fighting games for the Nintendo Switch (free)?

I'm looking for a good war or fighting game for the Nintendo Switch, preferably for free, can anyone recommend one? (Not Fortnite, Please)

That sounds stupid but fortnite

How old are you? From 16? From 18? You look very young to me

From 16 or 18. Don't worry. I'm about to turn 20 and just recently bought a switch. I'm playing Overwatch right now, but I want a game that has a bit more reality in it.