We ran a game at our club last weekend, replaying the 5th Battle against Morgoth. It played out almost as per the story. An alliance of Elves, Dwarves and the Men of the West and East, united in a battle to defeat Morgoth's army by pinning them at bay outside their fortress. But the spies and lies of Morgoth are many, and what seemed like a sure victory against evil, didn't quite go the allies way.
The Balrog and Glaurung the Wyrm were mortally wounded, and Fingon and the dwarf king Azaghal came so so close to finishing them off. But the Elven and Dwarven Kings fell at the last, and were carried from the field by their brethren.
Hurin and his House of Hador held the flank and pushed the orcs back to the gate. In the meantime the great Eagles flew down from on high and took out the deadly siege engines that had been raining down death upon the hapless elven units in the middle.
But this was all for nought as the allied races were betrayed by the race of men. The Men of the East in the far flank attacked the poor dwarves from behind - cutting them down, stabbing their former allies in the back, as the dwarves faced the orcs and trolls to their front.
The orcs trapped on the plains of Anfauglith... or are they?

Gothmog and his troll bodyguard step forth

The Eagles tear down the orc's siege engines which had inflicted terrible damage on the Elves.

Gothmog is brought down by Turgon and his Elves (and Eagle), but not before slaying Fingon