I can't say for sure, but these are the ones I would assume are NA server:
EU Battle Sat, 12:00 Fallen Brigade The Eastern Tsardom
EU Battle Sat, 18:00 Free Companies Of Calradia Knights Hospitaller
EU Battle Sat, 19:00 Horde of KHAN Knights Hospitaller
EU Battle Sat, 20:00 Fallen Brigade Knights Hospitaller
EU Battle Sat, 21:00 BIRD CLAN Among the Shadows
EU Battle Sat, 22:00 Horde of KHAN Knights Hospitaller
EU Battle Sat, 23:17 Free Companies Of Calradia Knights Hospitaller
At least some of them were, and if it's based on defender selection, then I'd say yeah, these guys. All NE factions.