Last night, the first siege of my current fortress arrived. I was not "fully" prepared for a siege in that I did not have a fully operational death course ready (working on it! the falling pit takes a while to excavate and smooth) but I did have a small squad of melee dwarfs kitted out with full steel armor and weapons. I restricted the civilians to the interior burrow and activated the squad, stationing them near the main interior entrance on the far end of a long two-cornered entrance tunnel (to protect them from being picked off at range by goblin bowmen.) Unfortunately, the militia captain stationed on the far side of the (double-thick) wall from the rest of their squad, right in the center of the entrance tunnel and in the sights of goblin bowmen firing from outside. I quickly changed the station order so they would back up from the wall a bit and the captain would path back around too them, but I was too late, the goblins were already at the entrance.
The captain ignored the order and charged at the goblins, while the goblin's assault leader simultaneously charged the captain. There was a single-stroke exchange, and the assault leader's head ended up two tiles from their body with but a swipe from the captain's steel short sword. The captain then proceeded to chase the rest of the goblins down and butcher them one by-one, even as their bowmen peppered them with silver arrows.
The captain returned to station completely unscratched, not even a bruise to show for it.