It may have already been told in that thread as I didn't really follow it, but I'll try to resume how the invasion is presented in the WD, with my usual goldfish memory:
- There are basically two armies going toward Altdorf at the same time.
- The Glott brothers and Spume lead the fleet, destroy and Elf fleet, destroy Nordland and burn a port city that happen to be Marienburg if I remember correctly.
- The Maggoth Lords go through the Middle Mountains, reach Talabheim, (which I guess they destroy since I assume they are present at the fall of Altdorf). At least I seem to remember it's Talabheim and not Middenheim but all Empire names sound the same to me.
- I'm also pretty sure that the heroes in the Battle Report are also the one present in the official fluff, that means that for the battle of Altdorf Nagash send Vlad and Gilles send Louen to help Karl Franz.
So the three cities falling must be Marienburg, Talabheim and Altdorf. I also wonder if something bad is about to happen to Louen and Vlad.