The embarkation of the troops had already commenced, when the king was suddenly warned of a plot against his life. One of his friends, Lord Scroop of Masham, in whom the king reposed such confidence, that he always made him sleep in his own chamber, and Sir Thomas Grey Heton, had conspired with the Earl of Cambridge, the brother of the Duke of York, and as treacherous as he. The king dead, the young Earl of March was to replace him upon the throne. The three conspirators suffered the penalty of their crime. Henry at length set sail for France, on the 13th of August, 1415. The fleet entered the Seine on the morning of the 14th, and thirty thousand men, which it carried, landed within a league of Harfleur. The spot was ill-chosen for the landing, and the defence would have been easy; but no obstacle presented itself to impede the operations of the English, and, on the 17th, King Henry laid siege to Harfleur. The town was strong and well defended by the Sire d'Estouteville; sickness was beginning to ravage the English army; several barons of consequence died, as well as a large number of soldiers; but the besieged suffered also, and the governor in vain asked for assistance. {16} The Sire d'Estouteville formed his resolution; he issued secretly out of the town and repaired in person to Rouen, where the French forces were beginning to assemble. But confusion and disorder reigned there; no one thought of delivering Harfleur. The brave governor returned, re-entered the town, and surrendered it on the 22nd of September, after a siege which had lasted thirty-six days. King Henry installed a garrison there, then embarked his sick and wounded soldiers, whom he sent back to England, and took account of his army thus diminished, nine thousand men at the utmost remained under his banners. His supporters hesitated to advance into France. Henry had sent to the dauphin a challenge to single combat; but Louis had not even replied.