So, I was playing a fortress for the first time in a while, and I was doing pretty well. Food and alcohol production was up and running, I had plenty of storage space, and I was building what was becoming a very respectable tower.
All this progress, however, came with a sacrifice: I was putting all my resources into producing trade goods and building my fortress, neglecting defense in favor of comfort.
Que a small marauding band of goblin spearmen. They ambush a worker, slaughter him, and begin to make their way to the heart of my outpost. With few options, I draft up 15 unskilled workers and one well-trained carpenter to stave off the attack. My superior numbers win the day, but at no small price: four of my brave dwarves lost their lives, and three suffered injuries so grievous that they might never recover. Among the dead was my outpost's lead carpenter.
The ambushes did not stop there, however: I've since lost more than 30 dwarves, and I'm only just starting to build up a defense capable of repelling these attacks without casualties. I only hope that I'm able to train my dwarves up to fighting strength before the goblins organize and mount a siege.
From all this, I've learned a valuable lesson: defense must be a top priority if an outpost is to last.
Focus:
Share your stories of lessons learned the hard way, fortress or adventure mode. As bad as mine is, I'm sure there's much worse out there.