See the screenshot. This army has been sitting here for several days with 500 prisoners. They won't siege or do anything productive and they won't sell their prisoners.
Do you have a save file of session that you experienced this issue? With your save file, we can reproduce the issue much easier and faster. For more information regarding how to send us your save files, you can check this thread out. You can find your save file here:
C:\Users\username\Documents\Mount and Blade II Bannerlord\Game Saves
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Okay. I uploaded my save file with the information that you requested. I think my army may be standing around like retards is because they have so many prisoners and they don't know what to do with them.