I traveled to the goblin dark tower to report the killing of cyclop to a goblin swordmaster, local leader who gave me this quest earlier. Along with me were team of 6 humans (3 children, 2 pikemen, 1 axeman) and one goblin hammerman. I recruited all of them earlier at this goblin tower, apparently goblins snatched a lot a children during wold gen, because most of local population were humans.
So I arrive at the site, go to the closest goblin tower, but when I am close to it a I see a ratman coming from the woods, so I go toward it to kill it. Then another 3 ratmen appear, then as I start fighting, I notice 3 antmen too, while I fight the ratmen and antmen keep coming, my companions also start fighting them (they were anitially far behind me, bacause I was perfectly agile, and much faster than them because of that). While we all fight more creatutes appear, I keep killing them with my Steel Warhammer, either by smashing their body or by propelling them away, the pikemen are stabbing them to death and chilrden punch and strangle them. When we killed about 20-25 of them they stopped coming so I moved further to kill 2 troglodytes that appeared there, when I started fighting, something that I have never seen before happened: ENDLESS STREAM of ratmen, antmen, troglodytes, and some large rats coming from 3 directions!!! I was initially very happy to make my killing list longer. So we fight, fight, fight... Blood spills everywhere, corpses starts piling up... I got tired after some time, then exhausted, so I continue fighting while prone. But these guys just won't stop coming! All 3 children died quite early in this battle. I keep fighting along with the rest, some local goblin fishery worker joined us too. The battle took long, VERY long, the longest battle I have ever had actually. My Unbelievably tough adventurer passed out 4 times during the time of the battle, it was so long. But we couldn't win this... All others except me and the human axeman were dead when I passed out the fourth time, surrounded by about 20 creatures, and then was strangled to death by one of the ratmen. Same fate happened to the axeman soon later. That is how it ended. My adventurer was legendary wrestler and very high level hammerman, shield user and armor user (something about Great level), yet we had no chance. They were just coming and coming and finally stopped nearly the very end.
The aftermath:
Note that there is probably about 3-4 corpses in every tile in the middle. You can see corpses of me, one of the pikemen, and some human peasant or swordsman a little further who apparently also took part in this battle. The corpses of the rest of my companions are buried under piles of ratmen and antmen corpses. At the east you can see a smaller pile of corpses, this is were we came from and where the first battle took place.
And my adventurer viewed in the legends mode:
I had only 25 other kills before that battle. Also the armed ones of my companions were quite good and probably killed even more than me if you count them together.
No idea why my body was impaled on a pike after that, apparently goblins do it to whoever die in their site.
Note that this was vanilla DF, and I used absolutely no hacks of any kind.
Also this was so epic, but is also SCARY. The next time I see any antmen or ratmen running at me in adventure mode I am going to run away as fast as I can...
But seriously, I have a save from just before travel, I am going to go to nearest mountain halls and recruit some dwarves too, then come to this goblin tower and see if this fun can happen again.