[5][non-primary source needed] During the turbulence of 1314 that saw growing friction between Edward II, Piers Gaveston and Thomas, 2nd Earl of Lancaster and his large private army, Marmion became involved in trouble for reasons not immediately obvious.

[6][non-primary source needed] Timber, two hundred sheep, fifty oxen and four carts were stolen and the abbot's servants suffered kidnapping, beatings, cuts and had their beards plucked out.

[6][non-primary source needed] The dispute seems to have been overtaken by events and after the disastrous Battle of Bannockburn Marmion was summoned to defend the north against the rampant Scots.

Marmion likely died at the battle, or shortly after, as on 7 May 1322[a] an inquisition post-mortem was held to assess his estates in Yorkshire which established that he owned West Tanfield, Wath, Langeton and Wirton manors, and one knight's fee in Exelby.

[7][non-primary source needed] A second inquisition found he owned Quinton, Gloucestershire, Berwick and Wingeton in Sussex, Luddington and Castre in Northamptonshire and Willingham and Winteringham in Lincolnshire.