Treaty of Troyes
Warwick spent much of the next decade fighting the French in the Hundred Years' War. He took a prominent part in the campaigns of 1417–18. Then he joined the king before Rouen, and in October 1418 had charge of the negotiations with the dauphin Louis and with the duke of Burgundy. Next year he was again the chief English spokesman in the conference at Meulan, and afterwards was Henry's representative in arranging the Treaty of Troyes. He held high command at sieges of French towns between 1420 and 1422.