The Adventures of Sir Daron
Sir Daron tries to calculate about how far a group of bandits could reasonably travel in a few hours and based on the terrain and the scenes of attack, where the bandits are most likely to be camping. Somewhere in his calculations, however, he mixes something up and the area they search is within a few hours ride but not a couple of hours walk. As a result, they find no evidence of any bandits. It is almost an hour before they realize their mistake.
Sir Daron, rolled 20 using 1d20. Battle.
Sir Daron takes a point in Battle (fumble).
You can feel free to attempt to calculate things again.