In my current fortress I've encountered a human siege for the first time, after several other types of battles.
First battle was an encounter with the local antmen who threw my expedition leader down a chasm.
Second was a kobold ambush. They killed one of my dwarves and wounded a few others before being defeated.
Third was a rampaging pirate thief (custom civ/creature) that destroyed several structures.
Fourth was an orc siege (Orc mod); they wiped out most of my military.
Fifth battle was a goblin ambush, thwarted by a single dwarf.
Sixth was another goblin ambush, they killed a dwarf.
Seventh was a third goblin ambush.
Eigth was an orc siege that nearly exterminated the dwarves in my fortress, but after a long guerilla war the dwarves triumphed.
Ninth was a 2 prong pirate attack that killed several dwarves and led to some building destruction.
All the while my dwarves were harrassed by skeletal woodland creatures outside the base.
Tenth was a human siege. The lamest battle of them all. The humans began their assault by milling about the edge of the region for a season, attacking the occassional zombie fox, and making no attempts to approach my base. Eventually they entered my base, were halted by a door and, well I'm just going to copy and paste my notes of the event:
*Heh, with the new fortifications I built, the humans were stopped at the entrance. Now once my crossbowdwarves are done with their booze break, they can pelt the humans at their leisure
*after their break, the marksdwarves returned to their posts, killed a few humans, and then returned to drinking booze. Meanwhile, the humans are stupidly milling about my entrance
*took a few more dead humies, but they eventually got the message and fled
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Go humanity!
![Undecided :-\](http://97.107.128.126/smf/Smileys/aaron/undecided.gif)