Manny played a distinguished role in the Scottish wars of
Edward III, being present at the
Battle of Dupplin Moor and the
Siege of Berwick. He captured the pirate
John Crabbe, whose expertise in fighting at sea would become of great value to the king. In 1337 Manny was appointed
Admiral of the Northern Seas, and in the following year accompanied King Edward to the continent, where in the campaigns of the next few years he proved himself one of the boldest and ablest of the English king's military commanders. Manny figured prominently in the defense of
Brest during the
Breton War of Succession. When
Hennebont was besieged during that War, councillors tried to persuade the Montforts, led by
Joanna of Flanders, to surrender to
Charles of Blois, nephew of
Philip VI of France. When she looked out a window, she saw the ships commanded by Manny sailing towards them. With the help of Manny and his small force, she managed to withstand the siege. In 1346, after the Breton War of Succession, Manny was captured, despite having been offered safe conduct, and thrown into prison at
Saint-Jean-d'Angély. He quickly broke out of prison and joined the
Siege of Calais, where he negotiated with the governor, after Philip VI had abandoned the city. He asked for mercy for
the Burghers of Calais, but Edward only granted this request when Queen Philippa added her pleas to his. Manny also took part in the expedition to defend the city once again in 1349, during that year's failed French
Siege of Calais. According to Froissart, King Edward III and his son fought incognito under Manny's banner. In 1347, he bought the parish of
Tunstall, Kent. Manny also took part in the campaigns of the
Earl of Derby in
Guyenne, being present at the battles of
Bergerac and
Auberoche. He was summoned to parliament as a baron by writ from 12 November 1347 to 8 January 1371. In 1359, he was made a
Knight of the Garter, succeeding John, Lord Grey (died 1 September 1359), and at various times he received extensive grants of land both in England and in
France. He was frequently employed by King Edward in the conduct of diplomatic negotiations as well as in military commands. He was one of those charged with the safe custody of the French king
John II when a prisoner at
Calais in 1360; in 1369 he was second in command under
John of Gaunt in his invasion of France. == Philanthropy ==