I'm playing 5.56b with ship.zip and monsters disappeared after "rampaging through city and disappearing into the wilderness" or after razing it they end up in the ruins. I was under the impression they were supposed to not disappear.
The first two monsters attacks have been pretty nasty. 1 naga + 2 phantom warriors and then 1 naga + 3 phantoms warrior. I think I would have to keep 1 or 2 nagas in each city as garrison until having enough longbowmen or halberdiers to actually defend. Large stack of swordmen and walls might also stop these but it seems not practical.
The first two monsters attacks have been pretty nasty. 1 naga + 2 phantom warriors and then 1 naga + 3 phantoms warrior. I think I would have to keep 1 or 2 nagas in each city as garrison until having enough longbowmen or halberdiers to actually defend. Large stack of swordmen and walls might also stop these but it seems not practical.