Kammala wannan jumla: A cikin shekaru masu zuwa Montagu ya yi wa sarki hidima a wurare daban-daban, musamman a cikin
Yaƙe-yaƙe na Scottish. An ba shi lada mai yawa, kuma a tsakanin sauran abubuwa ya sami ikon mallakar Isle of Man. A shekara ta 1337, an nada shi Earl na Salisbury, kuma an ba shi kudin shiga na shekara-shekara na 1000 Marks don tafiya tare da taken. Ya yi aiki a Nahiyar a farkon shekarun Yaƙin Shekaru ɗari, amma a 1340 Faransawa suka kama shi, kuma a madadin 'yancinsa dole ne ya yi alkawarin ba zai sake yin yaƙi a Faransa ba. Salisbury ya mutu ne daga raunuka da ya samu a gasar a farkon shekara ta 1344.