Courage the Cowardly Dog - Season 4 Episode 6
Windmill Vandals

The windmill is broken. Courage finds that whenever the windmill stops... four armored skeletons on horseback come towards him! He finds signs on the windmill vanes and his computer says they are mystic signs made by the first owner of the farm house. Vandals who had a broken paddle wheel needed energy, so they tried to steal the windmill, but the owner put mystic signs on them to keep them away. Whenever, it stops, the ghosts of the vandals come back... and they want to cut everyones head off! The windmill eventually gets fixed and the skeletons go away.