the plot on 1 August; four days later he sat in judgement upon them in a trial which ultimately condemned the conspirators to death. Henry V's expeditionary force landed in France on 14 August, and Mowbray took part in the first major engagement, the siege of Harfleur. It was also his last engagement of the campaign—having caught the dysentery that was ravaging the English army, he (and around a quarter of his force and a third of the entire English army) returned to England in October to recover. As a result, John Mowbray was unable to take part in what became the most famous battle of the campaign, at Agincourt, which took place on 25 October soon after he left France. He recuperated at his family seat at Epworth, Lincolnshire, although he had recovered sufficiently by November to travel to London to welcome the victorious Henry V home. Early the following year he also took part in the welcoming committee that greeted the Emperor Sigismund at Dover on his visit to England, which resulted in the Treaty of Canterbury of 1416. The following year Mowbray again contracted to go to France, this time with a bigger force than before, at 100 men-at-arms and 300 archers; he would not return to England for five years. During this period of the war he took part in some of the major sieges of the campaign, for example, those of Caen, Louviers, and Rouen. In February 1419, he was appointed to the captaincy of two French towns, but it would seem that Henry V—realising that these appointments would keep Mowbray occupied there, and "being apparently unwilling to proceed without his marshal"—cancelled them soon after. As a consequence of this, Mowbray was available to participate in the sieges of Évreux, Vernon, Ivry, Gisors and Melun later that year, the latter of which he played a major role, receiving its surrender in October that year. In 1420, Mowbray continued with his success in the military; the extent of his activity is indicated by the fact that he had to allow duties in England to pass by. He passed Christmas 1419 with the king at his Rouen base, until March, when he captured the town of Fresnay-le-Vicomte (with John Holland, Earl of Huntingdon), which was followed by the Battle of Le Mans the same month, in which the Dauphin, Charles Valois, was routed. That Christmas he indentured