u/Thin_Display_7650

Hello all! I'm running a campaign where the twist is, all my players play as Goblins! They're currently in an all out war with an army of undead controlled by 8 Arch Liches, whom are led by a Lich Emperor of sorts by the name of Ahriman.

Currently, their goal is to go around, liberating all of the cities they helped in my first act of this campaign.

My struggle is, I've never DM'ed an all out war before and liberating cities.

I'm open to suggestions and questions of all kinds!