The success of Henry of Trastamara decided him to take immediate action, and in 1369 he summoned the Black Prince as Duke of Aquitaine to meet the appeal of the Gascon lords in his court. [Sidenote: Renewal of the War] The Prince was maddened by the summons. "I will come," he replied, "but with helmet on head, and with sixty thousand men at my back." War however had hardly been declared when the ability with which Charles had laid his plans was seen in his seizure of Ponthieu and in a rising of the whole country south of the Garonne. Du Gueselin returned in 1370 from Spain to throw life into the French attack. Two armies entered Guienne from the east; and a hundred castles with La Reole and Limoges threw open their gates to Du Guesclin. But the march of an English army from Calais upon Paris recalled him from the south to guard the capital at a moment when the English leader advanced to recover Limoges, and the Black Prince borne in a litter to its walls stormed the town and sullied by a merciless massacre of its inhabitants the fame of his earlier exploits. Sickness however recalled him home in the spring of 1371; and the war, protracted by the caution of Charles who forbade his armies to engage, did little but exhaust the energy and treasure of England. As yet indeed the French attack had made small impression on the south, where the English troops stoutly held their ground against Du Guesclin's inroads. But the protracted war drained Edward's resources, while the diplomacy of Charles was busy in rousing fresh dangers from Scotland and Castille. It was in vain that Edward looked for allies to the Flemish towns. The male line of the Counts of Flanders ended in Count Louis le Male; and the marriage of his daughter Margaret with Philip, Duke of Burgundy, a younger brother of the French king, secured Charles from attack along his northern border. In Scotland the death of David Bruce put an end to Edward's schemes for a reunion of the two kingdoms; and his successor, Robert the Steward, renewed in 1371 the alliance with France. [Sidenote: Loss of Aquitaine]