I started a fortress with two males and five females. Everything was going great. All seven founders were Legendary in at least two skills. I had three children and three babies. I had a dozen livestock, thirty war dogs, and multiple lines of weapon traps and cage traps. In fact, my oldest child, a male, was just about to come of age.
Then a goblin ambush spawned inside my fortress. The goblins, lead by an elf, somehow made it past a dozen war dogs in a three width hallway completely undetected. They then apparently walked across three rows of weapon traps and two rows of cage traps without triggering a single response. I assume this represents a major bug of some form, as the gauntlet they navigated represents the only way into or out of the fortress.
Of course, the ambushers immediately jumped the closest dwarf, beating my mason to death, decapitating her two babies, and lopping off the right leg of her son, my oldest child, before my two miners picked them to death.
Naturally, the father and husband of the two dead babies, maimed son, and dead mason wife snapped and killed two war dogs and my other two children before the miners beat him to death as well.
Now a major trend, the parents of the two most recently slaughtered children also lost it, killed their only surviving baby, finished off the legless child, and got into a scrap with the two miners that left three of the four dead and my remaining miner with yellow upper spine damage.
The only remaining dwarf, my woodcutter and ranger, walked back into the fortress carrying a freshly killed groundhog, looked around, and promptly lost it. He killed all twelve of the chained war dogs one by one followed by the dozen livestock. Out of things to kill inside the fortress, he divested himself of his weapons, armor, and clothing and ran out into the wilderness.
His objective, a recently arrived giant eagle. Assaulting the avian horror with his bare hands, he managed to punch out the giant eagle's throat, a mortal wound, before the giant eagle ripped off both his arms and one of his feet.
I now have a blood-spattered fortress with sixteen war dogs picking over the remains of the ambushers and their former owners. The miner with the yellow upper spine is apparently paralyzed, as he is conscious but does not move. Surprisingly, the woodworker and ranger, who took on the giant eagle, is still alive. However, he is lying in the wilderness unconscious. I suspect he will be a long time in dying.