Since the weathertop is the one where Frodo gets stabbed, Weathertop, because it's the only one where Gandalf isn't there

pulls out gandalf imitation-indeed

Wathertop is correct you're up

Alright!

Battle of Tumhalad
Battle of Helms Deep
Diasaster of the Gladden Fields
Battle at the Black Gate

It's really simple!

Tumhalad had no fellowship members

Tumhalad - Barahir's Ring wasn't there.