Red Dead Redemption: Undead Nightmare

Anyone else played this? Im like 30% into it so far. Its pretty sweet. It can get kinda crazy when you are cleaning the towns of zombies.

And does anyone know how to get their last horse back? I had one of the horses of the Apocalypse (War) and then I was given an Undead Horse after saving a town, and I cant find War anymore. And the Undead Horse is garbage. It swerves all the time, and doesnt always come when you call it. It does have unlimited stamina, but so did War, and he was on fire.

You have to get all of them before you can get one back.