Sir William Russell was seated at Yaverland for the remainder of his life and played a central role in the defence of the Island from the frequent attacks by the French. He was appointed as one of three Wardens of the Island and Constable of
Carisbrooke Castle, the
caput of the Island, from which all manors were held under feudal ties. In 1294 he received royal instructions for putting the Island into a proper posture to meet the threatened invasion by France of the southern coasts of England. In 1295, still as a younger son, his brothers being still alive, he was elected to parliament as
burgess for
Great Bedwyn, Wiltshire, where the Russell family held the manor of
Little Bedwyn, apparently acquired by his grandfather John Russell. In 1297 he was summoned by King Edward I to join with his barons to muster in London in preparation for a military expedition crossing over to
Flanders. Sir William was summoned by royal writ to be at York on 25 May 1298 to oppose the Scotsman
William Wallace. He fought at the
Battle of Falkirk, where a great English victory was won. However, the Scottish forces regrouped and Russell was again summoned to join King Edward's army on 24 June 1300 at
Carlisle. , Dumfries, Scotland. Sir William Russell was part of the army at its siege in 1300 He was present at the
Siege of Caerlaverock later that year, during which his armourials were recorded in the eponymous
roll of arms made then by the
heralds. Russell was again summoned as "Sir William Russell of the Isle" to be ready at Carlisle in 1301, after which the army wintered with much hardship in Scotland. In 1302 he was appointed for a 2nd time a Warden of the Isle, with Sir John de Lisle. In 1307 Russell received another summons from King Edward I
Hammer of the Scots to join the royal army at Carlisle within 15 days of 8 July, to counter the aggression of
Robert the Bruce. Before the campaign commenced, the King determined on knighting his son, and was accorded by parliament the customary
feudal aid, a form of taxation, to meet the costs of the splendid ceremony. Russell was appointed as collector of this feudal aid for the county of Southampton. On this occasion the royal army was spared any fighting since Bruce had in the meantime been defeated by the border barons acting independently. King Edward II, just knighted as Prince of Wales, succeeded his father later in the year 1307 and called his first parliament to meet at Northampton, to which Sir William Russell was summoned by writ for the county of Southampton. Russell thereupon relinquished his duties as Constable of Carisbrooke Castle to his successor Nicholas de Bois. In 1308 by
letters patent Russell was appointed one of three justiciaries for the
Channel Islands to make enquiry into encroachments to the royal revenues. In 1309 Russell was summoned by royal writ to be ready "with horse, arms, and all his lawful service (i.e. retinue)" at Newcastle upon Tyne, by 29 September, to punish the Scots for their non-observance of the truce recently entered into. By now Russell was in failing health and being unable to meet the summons in person, he sent knights to serve in his stead. Sir William Russell died in 1311, leaving an only son, Theobald Russell, a minor aged 7. ==Succession==