My current fortress was hit by a siege of 120 goblins including three local leaders. But there was one particular goblin to note, Stozu Oxtrararstruck Baxstutspen. Stozu was an ultra-mighty, perfectly agile, supergoblinly tough legendary macelord. This goblin legend carved through my army of legendary wrestlers, killing 3 before being knocked into a channel. Unfortunately this channel lead directly into my fort allowing the goblin to rush through my unarmed civilians. From there the goblin decided to kill all of the marksdwarves sitting on the wall who were sniping any goblins below. Stozu succeeded in this as well. While Stozu was rampaging through my base, the remaining army on the other side of the wall were busily killing scores of goblins. They were doing their job well my dwarven army forced the goblin army into a retreat. Stozu aware of the retreat decided to leave as well. However the only way out for Stozu was through my army of 4 remaining legendary wrestlers, a single marksdwarf and about 16 war dogs. I had him trapped in my own fort.
So Stozu charged through the remaining defenders like a rocket. Blocking everything my dwarves could throw at him, Stozu ran straight past the defenders and on to freedom. The only wounds I could give him were a brown spine and a couple of light gray bruises to various other body parts.
Also another thing that you might find interesting is that this goblin was wearing about 29 pages of elf leather and elf bone trinkets. He was one mean goblin.