system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] What were the dwarves doing during Lord of the Rings? Moria is clearly not the only dwarf city, so what were they up to?
gpt
There was a battle around Erebor. Since the death of Smaug and the passing of its throne to Dain upon Thorin’s death in the Battle of Five Armies, Erebor had become pretty prosperous by trade through Lake-Town, and became the new centre of the Dwarven world.

At the same time as the Seige of Gondor - indeed, not two days from the Pellenor Fields - Rhunian legions allegiant to Sauron attacked Lake-Town and forced the men there to retreat into the mountain. When news of Sauron’s defeat reached the easterling offence a little over a week of siege later, the tide turned. On the same plain before the mountain gate where the Battle of Five Armies had been fought, lake-men and dwarves sallied out together to win the day, and the chronologically last battle of the War of the Ring.