To answer your questions;
I just made the army cause at that moment I wasn't aware I could just let an army rest in my hometown. So I made an army again and again every time I went back to my hometown.
I didn't disband it cause I had the army before entering the quest, and when I came back out of it there wasn't any army anywhere and my hero respawned at my base as a lvl 15 char.
By the way, I recently deleted the elven city and I created and started a human city, cause I learned a lot more about the game and wanted to start a fresh new city.
A big thank you, once more, for helping me this quick. If you need any more info, please let me know. I also backed up the log.txt 's for later use (if you would need them or something). The log is around the time I had that bug.