Portrayal of Rohirrim

[WarBringer]

I just saw the trailer for the two towers on the dvd(like a kid who throws away the card and takes the gift, i did the same with the special features disk)While i do realize that the rohirrim are akin to the numenoreans, why is it that PJ made them look so much like he numenoreans during the battle?Is the kinship the sole reason. The trailer showed the rohirrim using the sme type of weapon that the numenoreans used in the fellowship prolouge. Why is this?