My fortress had been plagued by goblin ambushes, and I had usually solved the problem by keeping the gate (a bunch of grates, idiotically, since everyone would see the goblins through them and go "Urist cancels pulling doomsday lever: goblin is three miles away") shut and waiting for them to go away. But after a few years of losing two woodcutters/fisherdwarves per year I decided to kill them off with my newly trained military: champion wrestlers/novice macedwarves and crossbowmen.
So I sent the Marksdorfs at the enterance and sent the champions out to save a few peasants.
Long story short: All the marksdorfs die, and I'm stuck with the moronic macedwarves. I decide to not open the gate again.
But then a damn Immigration wave comes, and the Dungeon master with them. So I decide: Hmm... I got to let them in, so I'll open the gate and wait till they're all inside, and then quickly shut it again.
But since I had forgotten to build a meeting place inside they just stood there. In the meantime a goblin ambush appears, so I sent the champions out on it. But because only one champion could get there in time, and because they had bows, the only thing that happened was me losing a champion.
So I decide to pull the lever and close the gates, but because of bad design you had to pass the gate to close it, so everyone who went to pull it ran off.
My champions decided that this would be a very good time to go and have a drink, and did so. Meanwhile, ANOTHER goblin ambush squad appear, and after a bit of fiddling around I draft everyone to fight them. When a few of them had charged and reached the goblins, they discover an ADDITIONAL goblin ambush waiting for them.
I managed to eventually kill the goblins off, no thanks to the (skilled) military, but all my miners, administrators, the mayor, all the peasants and a few food producers died. Blood everywhere!
The gate is the construction west of the large bridge over the magma channel. In order to shut it you need to go up the stairs north of the entrance.
There are goblin/dwarf corpses spread around in other parts of the fortress aswell, mostly the booze stockpiles, the corner of which is visible in the bottom left corner, though most of them are on screen.
FUN!
Incredibly enough, this didn't cause a tantrum spiral, and I got a grand total of one tantrum even though the majority of the fortress was unhappy after this. I guess only the unpopular dorfs died.
The fortress has since recovered and has now a less retarded entrance.
There also was the time a dorf went berserk after not completing his artefact and went chasing a child up the passage seen in the top right corner. In order to save the dorfs in his path I lock their doors so he can't get in to them. After a while the champions kill Urist McRage off, and I go off and do other things.
Because a quarter of the fortress population is in bed recovering from wounds it took me a while to realise why my armorsmith had died from dehydration.
Fun fact: at the moment there are two dwarves walking around with a red wound on their left lung. Apparently it doesn't bother them very much.