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.
Hundred Years' War
In 1341, conflict over the succession to the Duchy of Brittany began the War of the Breton Succession, in which Edward backed John of Montfort and Philip backed Charles of Blois. Action for the next few years focused around a back and forth struggle in Brittany. The city of Vannes in Brittany changed hands several times, while further campaigns in Gascony met with mixed success for both sides. The English backed Montfort finally succeeded in taking the duchy but not until 1364.