I have been playing with the Fortress Defence Mod in place and was besieged a little while ago by War Elephants. In case you don't know, these are elephants armoured in iron and steel and armed with iron and steel mauls and morningstars. I ordered all of my dwarves inside, opened the secondary gate which is a long corridor two spaces wide with a large array of weapon traps at the start, and an open ceiling above where marksdwarves rain bolts down upon them, before they reach a fighting pit (also accessible to marksdwarves two levels above) filled with war grizzlies, lions, and wolves. Beyond that, there's a second fallback area with even more animals, marksdwarves, and melee dwarves.
Anyway, so these War Elephants showed up and I activated my alerts, safely evacuating everyone inside and getting all of my military to their positions...all except one. A lone hammerdwarf who had been on patrol had trouble understanding that he was supposed to run the gauntlet with the elephants behind him, leading them to get slaughtered, and couldn't find the easily accessible trapped entrance if his life depended on it, which it did. A squad of the elephants, led by a Champion, find him. There's about 11 of these guys. In true dwarf fashion, he utters a fearsome battle cry and raises his trusty exceptional steel war hammer and masterwork steel shield, and charges the elephants in his full raiment of steel armour.
He then proceeds to slaughter their champion and four other elephants, breaking his lower left arm in the process but refusing to give up his hammer or the fight until the rest of his squad arrives and assists in finishing the job. He killed five war elephants with a broken weapon arm and kept on fighting! I immediately nicknamed him Elephant Slayer and started work on a very nice room for him.