My venetian migration campaign. I had a full stack of italian spear militia, feudal knights, and dismounted knights but didn't have a general in the army. My faction leader had about 4 authority. I sent my army to take thessaloinca and then poof, they were gone leaving recently taken constantinople with a pathetic garrison. I would almost lose constantinople, but barely won due to blind luck. Pathetically, i would find that i had an extra good general right next to constantinople that would have probably stopped the desertion