It's the 10th year of Drilledirons, and the hiding is over. For 10 years we've sat behind closed gates while the ailed forces of evil sit outside, waiting for an opportunity to reach us and our amassed wealth. Today we will let them in; today they die!
So 10 years into this fort, I've got 40 dedicated soldiers decked out in masterwork mithril (about 75% better than steel, weight of aluminum) and they've been sparing for about 5 years. They all have masterwork weapons, steel battleaxes, platinum hammers (heavier than silver) and 8 of them with crossbows.
I've decided to not use a danger room this time, and figure 5 years of sparring must be worth something... right? No, it's not.
They manage to wipe out 2 of the 5 enemy squads, the third overtakes them and the other 2 arrive and wipe most of them out. That's just the first singeing civ, I'm using a mod, so there's 3 others on their way down the stairs now too.
Now that my 5 years of training and 3 million in armor and weapons are bled out on the cavern floor, I'm too disappointed to close the inner gate and rebuild; I let the enemy in.
They pour through the halls like water, 200 of them at least, swarming everywhere. At least I'm sure some of them went blind when they got to my stockpiles and were dazzled by the 750 gold barrels that held all our food.
A berzerking dwarf kills the last sane citizen before the enemy can reach them.