Lord's Collection
The lord of a neighboring land owes a debt to your lord baron, and has been sanctioned to collect it as he sees fit by the duke's court. The party is recruited to make that collection through conquest or pillage as they so choose, while the neighboring lord and most of his soldiers are away on campaign.
PCs will be human commoners from the lands of one or both of the feuding lords who also have minor grudges against him.
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