In charge to serving the English King against the Scots, during the battle he was sorrounded, unhorsed and had to fight hard for his live.
Wounded he managed to hide in the bushes where he took off his armour. The following day, nobody paid attention to a guy, that dressed only with a shirt wandered around the ex-battlefield.
Finally he saw the scottish King Robert the Bruce, so he approached him and kneels down.
"Oh, welcome Sir Marmaduke, of whom you are prisoner?" asked the King."Of nobody Sir because i don't want to surrender to anybody excepting for you", answered the shrewd Marmaduke.
Bruce made him get up, hug him and led him to his tent.
Some days later Marmaduke was free to return to his land in Yorkshire.