Sigh. Three goblin ambushes spawning right ON my drawbridge in a row, and FOUR dwarves seriously injured (missing leg) while attempting to take down ONE goblin.
It seems that military forces effectiveness varies so much from fort to fort - I've had 4 dwarves take down a bronze colossus, while 6/8 are out of it taking out 2 goblin bowmen. And don't ever get me started on lashers...
They didn't spawn *on* the drawbridge. They spawned on an edge of your map, and walked to the drawbridge without being seen. Ambushers are sneaky like that. And strictly speaking you probably only had one multi-squad ambush because each squad has to be discovered individually.
There are several ways to deal with this. An ambushers caught in a cage trap reveals his squad, so an impenetrable line of cage traps 5-10 squares before your fort starts work. So do animals, so chain a few random donkeys in front of the drawbridge, or let your kitty-cats roam the map to hunt for vermin, and you'll be better off.
Bowman beat melee dwarves in long distance fights, which means if your military is only axedwarves they all have to charge the bowman at once and somebody's gonna die. The solution is to have some Crossbowdwarves of your own, and a nice safe place for them to shoot from, near your entrance. Right now I've got a tiny little tower overlooking the road to my depot, when I get some bowdwarves it'll be permanently manned. Note that the line of cage traps I mentioned will reduce this problem significantly because lots of their archers will be behind bars, and not trying to kill you.
Archers and traps are the only current solution to lashers. Whips are hideously overpowered in the current version, so you have to get them before they get you.
Anyway, sorry for complaining - I have had NO dwarves with Diagnostic skills in the last two forts. It's still a completely randomly generated skill right? So I can just enable it and someone will do it, but do it very badly?
My current Chief Medial Dwarf has basically no medical skills. He has managed to diagnose injuries (but not infections), suture up wounds, and set broken bones. So you'll probably lose a few guys if you don't get a trained Diagnostician in the next immigrant wave, but hey.
A small fort can't have everything.
Nick