Real life intervened so I didn't play DF for a week.
Vampire soldiers are terrifying machines. Human macemen siege got torn apart, except for their valiant leader, who used a tactical retreat ran away.
Initially, hauling is much faster, because everyone is stronger and faster.
I notice that it's hard to keep the population happy, due to the missing eating/drinking thoughts. Some tantrums happen, and the fist fights cause some injuries to civilians.
I turned up the popcap to cause migrants to appear. Some enter almost immediately.
Dwarven caravan comes and leaves without a problem.
The vampires don't do anything to the migrants who are awake, though I felt sorry for that guy who was the only person eating at the table in the crowded dining hall. I had some meat on hand because I butchered an animal to get bones for a strange mood. When each migrant decides to sleep (one at a time), ALL of the vampires in the fort dogpile into the bedroom and drain the poor dwarf dead. Vampires ignore dead bodies on a one week timer, as the missing and found announcements happened at the same time. Vampires don't witness each other during feeding. However, vampire dwarves still become unhappy that their relatives died.
While in 'V'iew Units, "on break" dwarves always use the darker cyan (spore tree, peasant) text, in the 'U'nit List it is different. On the 'U'nit List, dark cyan dwarves are really "on break", whereas feeding vampires are shown as light cyan (microcline) "on break".
Mining and other tasks are becoming painfully slow. Letting vampires feed on migrants (lock the door so only one vampire feeds) doesn't make them speed up work again. It appears that the alcohol dependant bug is verified.