The siege of Brest in 1386 was a siege by forces led by John IV, Duke of Brittany, against English-occupied Brest during the Hundred Years’ War. The siege was relieved by an English army commanded by John of Gaunt, Duke of Lancaster. Citations References 1380s in France 1386 in England Conflicts in 1386 History of Brest, France Military history of Brittany War of the Breton Succession