According to Matthew Paris, Philip Augustus had taunted his son with not understanding his business as a commander-in-chief, because he was attempting to conquer England without first securing its key.[1258] At any rate Louis, soon after his return to London, perceived that his hold on the country would never be assured till Dover and Windsor were both in his hands. On July 25 he set out for Dover,[1259] and a day or two later the counts of Dreux and Nevers, with some English barons, laid siege to Windsor.[1260] Of this latter party the Flemish soldier-chronicler of the war says, “Long were they there, and little did they gain.”[1261] They in fact sat before the place for nearly two months in vain.[1262] The siege of Dover proved longer still, and for many weeks bade fair to be equally unprofitable. Many of Louis’s followers went back over sea to their homes, “so that the host dwindled marvellously.”[1263] On August 8, however, the town--not the castle--of Carlisle surrendered to Alexander;[1264] and he at once began to move southward for the purpose of joining Louis. Still a whole month elapsed before the junction was effected. On his way the Scot king stopped to besiege Barnard castle, held by Hugh de Balliol for John. The siege appears to have been unsuccessful, and it cost the life of one of the foremost leaders of the baronial party in the north, Eustace de Vesci.[1265] Some of the other northerners were now helping Gilbert de Gant at the siege of Lincoln castle. This time its constable, Dame Nicola de Haye,[1266] bought off her assailants, who thereupon united their forces to those of Alexander.[1267] The combined host seems to have reached Kent about the second week in September.[1268] Louis went to meet Alexander at Canterbury, brought him back to Dover,[1269] and there received his homage for the lands which he held of the English crown.[1270]