Edward stayed some little while at Calais, during which time Prince Edward led frequent foraging expeditions into France. Pope Clement VI. had been unceasing in his attempts to make peace between the Kings of France and England. Now once more his legates appeared upon the scene, and at last succeeded in negotiating a truce, which was agreed upon on the 28th September, and was to last till a fortnight after the next Midsummer-day. On the 12th October, the King and his son landed at Sandwich. This time he did not return without having done something decisive. Between the 10th July, 1346, and the 4th August, 1347, the great battles of Cressy and Nevil's Cross had been won, and Calais had been taken. The Tower was crowded with noble prisoners; the whole country was enriched by the spoil won from the French. All this showed the power of the English people, the ability of their King, and the bravery of his son. It was a proud moment for England when her King and his son came home, crowned with the laurels of victory. After this Edward stayed almost constantly in England, and devoted himself to domestic legislation, as he had entire confidence in the ability of his son to conduct foreign campaigns. It is supposed that Prince Edward gained the name of the Black Prince from the French, after the battle of Cressy, when he fought in a black cuirass. Some time after the siege of Calais Edward III. left England once again, to indulge in an adventure which was more befitting a knight-errant than a king. He heard that Geoffroy de Chargny, a French knight, had been trying to bribe the Genoese commander whom he had left in charge of Calais. Edward gave orders that the negotiations should be continued, and arrangements made to admit a body of French soldiers, under Geoffroy de Chargny, at the great gate of Calais leading to Boulogne. He then crossed the seas with his son, Sir Walter Manny, and a picked body of knights. The King and his son were to fight disguised under the banner of Sir Walter Manny. At the hour appointed the great gates were opened, and the French were preparing to enter, when the English sprang from their ambuscade, and with shouts of "Manny to the rescue," fell upon the French. Sir Geoffroy saw that he had been betrayed; but turning to his men, he said, "Gentlemen, if we fly we shall lose all; let us fight valiantly, in the hope that the day may be ours." Then there were many stout passages of arms between the English and the French. The King of England singled out the bravest knight among the French, Sir Eustace de Ribeaumont, who had no idea with whom he fought, and twice struck Edward down on his knees. At last he was obliged to surrender himself to the King, and the honour of the day belonged to the English. All the French were either slain or captured.