Hundred Years' War
Historians commonly divide the war into three phases separated by truces: the Edwardian War (1337–1360), the Caroline War (1369–1389), and the Lancastrian War (1415–1453). Local conflicts in neighbouring areas, which were contemporarily related to the war, including the War of the Breton Succession (1341–1365), the Castilian Civil War (1366–1369), the War of the Two Peters (1356–1369) in Aragon, and the 1383–85 crisis in Portugal, were availed by the parties to advance their agendas. Later historians adopted the term "Hundred Years' War" as a historiographical periodisation to encompass all of these events, thus constructing the longest military conflict in European history.
Anglo-Scottish Wars
France also played a key role throughout the period of the Anglo-Scottish Wars. Scots and English soldiers on French soil during the Hundred Years War (1337–1453) generally fought on opposing sides, with the Scots standing for the French against the English under the Auld Alliance. France in later periods, in turn, often intervened on Scottish soil for the Scots. This French involvement had increasingly complex political consequences for all sides by the later 16th century.