I still remember my most recent fortress mode cyclops, even though its been almost half a year. I had 2 squads who I had been training using training spears, but forgot to change equipment before sending them to kill it, by some miracle, they dodged all of its attacks for about 20 attacks despite having no dodge skills at all, then one of them either punched or bashed the cyclops in the face and got lucky, knocking it out. What followed was around 20 in game days of a circle of 14 dwarves mercilessly beating a puddle of bruises that was once a cyclops, as training weapons do next to no damage, occasionally it would wake up, then immediately give in to the pain again, with the only non bruise damage coming from whenever a dwarf would decide to punch, kick, or bite instead of using their main weapon. It FINALLY ended when one of dwarves punched it in the head, tearing the brain through the skull, putting the poor thing out of its misery.

My dwarves went in competent speardwarves and came out around grand master level, all very dehydrated.