My last siege was pretty massive by my standards. I think it was about 30-40 diomedian ponies, including at least one dark princess who spent 8 combat pages trying to stab my unconscious militia commander in the head before she got it right. All were riding camels or jaguars.
My marksponies kind of suck. They managed to kill most of the mounts, but not many diomedian ponies. Instead, since my roof isn't done yet, the pegasi flew out and started trying to melee them with wooden crossbows with predictable results. That dark princess got at least 3 herself.
I had to replace probably half of my militia, and from the sounds of things, that wasn't really even a large siege. Good thing I finally have some adamantine gear instead of just copper. I also installed a lot of traps around my fort, we'll see if they help.
Actually, I haven't seen any sieges or ambushes in 3 or so game years, and only that forgotten beast that killed Rainbow Dash and Scootaloo with its bad breath. I had a keshi pony diplomat show up and talk to my baroness (Celestia), did they organize a peace treaty or something? I've seen no mention of any such thing, and the civilization screen still shows terror and vengeance as the imports and exports to a diomedian pony civ.
I'm still a bit new to the terminology, but what's a draltha pony? I see in the combat logs one of them recently hacked a random wolf apart with his lash, but I see no sign of him elsewhere. I'm guessing this was some sort of sneaking thief, who ran when he encountered the wolf, right?