The horses of zombie apocalypse arrived the same day as the caravans and liaison. Before they had drifted in and out of the edges of the territory, but the day that was best for briskly moving all the scattered clutter to a central location was the day they had to spook my haulers and kill their cats. I sent out the squad to take care of them quickly, but every time I would collapse a bundle of them, another knot would show up in another direction and head to the fort at a shambling gallop. They were taken out pretty easily, but that last bunch must've been eating their oatflesh, and they were evenly matched in numbers, and those were the ones that knocked half the squad into the hospital, including the militia commander's lover and the chief medic.
Fortunately I just got an immigrant who was an even better doctor. Unfortunately we didn't have soap-making capabilities, and infection took out three, including the commander's bf. After that, she remained stationed in the barracks/hospital, and kept the remainder of the squad there, unable to perform civilian duties, like treating injured or making soap or getting food. No matter what I did, I couldn't get them back to civilian alert, so I took dwarves out of the squad. As soon as I relieved her of duty, she went insane. Oddly enough, she became lovers with the expedition leader at the same time; if there was a misery fling going on somewhere, it was too quick to witness, and didn't cure her melancholy.