All King David's sons arose and fled on their mules when Absalom murdered Amnon at Baal-hazor. (2 Samuel 13:23-29)
Absalom rides a mule under an oak tree during his battle against David and gets caught and killed
Absalom rode on his mule and met the servants of David, but his hair caught in the thick branches of a great oak. He was suspended between heaven and earth, while the mule went on. (2 Samuel 18:9)