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His first notable act was to take advantage of a weakened [[Scotland]] following the death of [[Robert Bruce]] (1329).  He refused to honour the “shameful peace” organised by Isabella and Mortimer in 1328, supported the claims of [[Edward Balliol]] against the 5 year old [[David II]], and in 1333 laid siege, to [[Berwick upon Tweed|Berwick]] Castle. A relieving Scottish force was resoundingly defeated at Hallidon Hill near Berwick; but further campaigns achieved little, partly because of French support for the Scots – a state of affairs to be repeated many times in the stormy relationship between the two kingdoms up to as recently as the 18th century.

His first notable act was to take advantage of a weakened [[Scotland]] following the death of [[Robert Bruce]] (1329).  He refused to honour the “shameful peace” organised by Isabella and Mortimer in 1328, supported the claims of [[Edward Balliol]] against the 5 year old [[David II]], and in 1333 laid siege, to [[Berwick upon Tweed|Berwick]] Castle. A relieving Scottish force was resoundingly defeated at Hallidon Hill near Berwick; but further campaigns achieved little, partly because of French support for the Scots – a state of affairs to be repeated many times in the stormy relationship between the two kingdoms up to as recently as the 18th century.

In 1337 hostilities broke out in the feudally complex south-west of France between the English and French crowns. Initially generated by France’s desire to take advantage of the English focus on Scotland, and the age old competition for trade in [[Gascony]] and the Lowlands; this time the contest became “personal” when Edward claimed to be the rightful king of France after the extinction of the [[Capetian]] royal line a few years earlier. (Under English law his claim was valid, but was political and emotional anathema to the French nobility.) This was the start of what has become known as the [[Hundred Years War]], which dominated much of Edward’s reign.

In 1337 hostilities broke out in the feudally complex south-west of France between the English and French crowns. Initially generated by France’s desire to take advantage of the English focus on Scotland, and the age old competition for trade in [[Gascony]] and the Lowlands; this time the contest became “personal” when Edward claimed to be the rightful king of France after the extinction of the [[Capetian]] royal line a few years earlier. (Under English law his claim was valid, but was political and emotional [[anathema]] to the French nobility.) This was the start of what has become known as the [[Hundred Years War]], which dominated much of Edward’s reign.

The war in its various stages over the first twenty years was successful for the English. The sea battles off [[Battle of Sluys|Sluys]] (1340) and [[Winchelsea]] (1350) and the capture of [[Calais]] (1347) gave England command of the sea and the approximate French coast. The battles of [[Battle of Crecy|Crecy]] (1346) and [[Battle of Poitiers|Poitiers]] (1357) introduced to European conflicts the devastating power of the Anglo-Welsh [[longbow]], and showed Edward and his eldest son [[Edward the Black Prince]] to be able planners and commanders of men. The ransoms received for the return of the French nobility captured at these battles went some way towards alleviating the extreme costs of the war. In the Treaty of Calais (1360) England won recognition of sovereignty over [[Aquitaine]] and an area around Calais.

The war in its various stages over the first twenty years was successful for the English. The sea battles off [[Battle of Sluys|Sluys]] (1340) and [[Winchelsea]] (1350) and the capture of [[Calais]] (1347) gave England command of the sea and the approximate French coast. The battles of [[Battle of Crecy|Crecy]] (1346) and [[Battle of Poitiers|Poitiers]] (1357) introduced to European conflicts the devastating power of the Anglo-Welsh [[longbow]], and showed Edward and his eldest son [[Edward the Black Prince]] to be able planners and commanders of men. The ransoms received for the return of the French nobility captured at these battles went some way towards alleviating the extreme costs of the war. In the Treaty of Calais (1360) England won recognition of sovereignty over [[Aquitaine]] and an area around Calais.