So, there I was, a fortress with 5 artifacts done, food stockpiles so overflowing that i had to turn off farming, an underground spanning 171 z-levels wich i only started to graze as of yet (found a cave almost 20 levels high with only a single giant olm at the bottom, fending off the ocasional kobold...
...and then the goblins came. Ambush! , almost on top of my main gates. First unpleasant surprise: the option to disallow civilians into outdoors isnt there anymore, so a few got slain by the approaching creatures. Then came the equipment hurdles: axedwarves that stubornly refused to let go of their wooden axes, hammerdwarves wich are good at breaking every limb of enemies but lowsy at actually killing (on my arena tests in most of my one-vs-one armored fights the dwarf with the hammer almost always won...taking a rather long time doing it), and hunters-turned-crossbowmen wich decided that bolts are for pansies and "crosshammers" being the true dwarven way... 3x5 dwarf squads, this against about 5 goblins, almost each of them a spearman.
Results: 8 dwarven deaths, 1 being a baby and 4 civilians caught outside, 3 axe lords dead (clad in iron chain) and 5 other warriors wounded (im impressed with hospitals by the way... except for one critically wounded dwarf, still bed-ridden, all the others recovered in a fraction of the time they would before.
So... some adjustements were in order. Made my main fortress into one major burrow, allowing only Woodcutters/Hunters and Engiminers outside (in the future im clading them at the very least in leather armor+shields and give them training). Placed some Wardogs in strategic positions and carpeted the entrance with cage/weapon/stonefall traps.
Another Ambush quickly sprung, with double the numbers of goblins, featuring 4 ranged goblins and an assortement of about 5-6 meleers. Ive let them test my traps before reaching my defenders. While they sucessfully bypassed a number of traps that in 40d would have probably killed 2 or 3 sieges worth of goblins, the surviving ones were severly weakened before engaging war dog/dwarf and mandrill alike. While i still had some equipment problems, this battle was sucessfully fought with 2 canine losses and a single civilian woodcutter death.
To add insult to injury, the ranged goblins got surprised by the guards of the first human caravan to reach my fortress... one of them literally whiping a goblin crossbowman to death.
And then i crashed. I have a seasonal save, but i'll have to redo this last battle all over again assuming they came again :p