As the first Mûmakil falls, immediately sprint back toward the ramp down to the battlefield,
as another will follow, and this one's too far from this hill for your attacks to reach it. (When
the game cuts to show an advancing Mûmakil, look closely and you can see which side it's
closest to--the ordering is random.) Run across the field and up the ramp on the other side,
and repeat the process of taking the beast down. Once this second animal bites the big one,
stay on this hill but move to your left, toward our endangered friends. The Witch King will
appear and begin attacking them. Your job is to convince him that that's a bad idea, and your ranged attack should do the trick from here. If at any point you notice yourself running short of ranged ammo, more constantly spawns in at the top of the ramps. Next comes another
Mûmakil, then the Witch King once more. One more Mûmakil, then a third attack by the
Witch King. A fifth Mûmakil, then another showing by the Witch King (sick of this pattern
yet?). A final Mûmakil, once last battle with the King, and then things will begin to look
grim--for a moment.