Winter Duty: Vampire Earth (Book 8)

Major David Valentine and his fugitive battalion are the remnants of an expeditionary force shattered in its long retreat from disaster in the Appalachians. And Valentine is losing allies fast. Some of the clans in the region have declared themselves in favor of the vampiric Kurians, throwing Kentucky into civil war. But instead of retaking the region, the Kurian overlords have ordered the extermination of every human living there.