The 13th Warrior (1999)
The following perhaps aren't films showing warhammer influences, but definitely films that influenced warhammer while it was taking form. Yes, 1980s and earlier.
Fantasy films:
Willow (1988), most definitely! Also one of the rare films outside of the Tolkien sphere with halflings.
Legend (1985), maybe. At least eye-candy for miniature painters. Pivotal portray of goblins and a demon. Remember, goblins used to be somewhat chaotic in the Warhammer world originally.
Dark Crystal (1982). Not so much the plot. But Skeksis - talking about greater daemons of Tzeentch... And GW put that planetarium on the Empire wizard wagon kit.

More or less historical films:
El Dorado (1988). Think of the enemy within.
Aguirre, Wrath of God (1972). And some other Kinski film set in the 16th century. Dracula too. One or two Empire characters actually portray Klaus Kinski, I believe.

The seventh seal (1957). Death!
Several Dracula versions or other medieval/early modern vampire films.
For mass battles, expendable armies, generalship, and finally the effect of gunpowder, I'd look into Japanese historical films, mostly by Kurosawa. Soviet historical films also have big medieval battles portrayed with masses of real enactors.
Now which pre-greenscreen films portray Dwarfs, Orcs & the more exotic creatures? I'd like to see such a film.
-Z