Hmm, just had a recent expererience with Abyssians.
I had a hungarian campaign going where I ended up conquering all the way out east, to Khazar. However, as usual, my defensive line is drawn at Kiev, due to the bridge. Now, what to do with Khazar when the mongols invade? I built a merc post there and stuck a unit of Abyssians in addition to a merc organ gun, which somehow existed. I had built the fort up to a castle with both upgrades by the time the mongols came. They assualted the castle right away.
Anyways, over the time the abyssian had been awaiting his inevitable death during the campaign, he got traits which put him up to three valor. When it came time for the assault, the abyssian managed to fend off three steppe cavalry, one alan merc cavalry, one Mongol heavy cavalry, and one mongol warrior, before finally succumbing. Bear in mind, that after breaching the outer gate, the mongols set up their warriors outside the inner wall, raining arrows over and through(?) the wall down on the guards while they were fighting. My guess is that if the guard hadn't been getting shot up by arrows, which somehow went through a stone wall, he could have lasted much longer.
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