More can always be said on the matter, so if anyone passing by would like to write up a post of their own, feel free to go ahead! In the meantime, as the matter of medieval banditry pops up every so often, here are a few previous answers on the same matter:

• u/idjet covers banditry in general and also links back to one of their previous answers on the same topic;
• u/Wagrid examines two particular bandit gangs;
• and u/sunagainstgold also has an overview, plus an examination on caravans.