I have two answers but I can only say one so Ill go ahead and say donald first

Leading my people against an army of hundreds, - when it says my people this gives me the hint that its donald because he always acts like he is the leader..

I shall never let my resolve falter. - donald never does.

With dignaty, I shall never bow - he has alot of dignity
to the one who wields darkness.- he will never bow to the darkness
Who am I?
if its not donald its ..... Ill say this one if donald is wrong.