Two girls and a son had by this time been born to him, and the months passed quietly and happily away until Bruce summoned him to join, with his retainers, the force with which Randolph had sat down before Edinburgh Castle. Randolph was delighted at this accession of strength. Between him and Douglas a generous rivalry in gallant actions continually went on, and Douglas had scored the last triumph. The castle of Roxburgh had long been a source of trouble to the Scots. Standing on a rocky eminence on the margin of the Teviot, just at its junction with the Tweed and within eight miles of the Border, it had constituted an open door into Scotland, and either through it or through Berwick the tides of invasion had ever flowed. The castle was very strongly fortified, so much so that the garrison, deeming themselves perfectly safe from assault, had grown careless. The commandant was a Burgundian knight, Gillemin de Fienne. Douglas chose Shrove Tuesday for his attack. Being a feast day of the church before the long lenten fast the garrison would be sure to indulge in conviviality and the watch would be less strict than usual. Douglas and his followers, supplied with scaling ladders, crept on all fours towards the walls. The night was still and they could hear the sentries' conversation. They had noticed the objects advancing, but in the darkness mistook them for the cattle of a neighbouring farmer. Silently the ladders were fixed and mounted, and with the dreaded war cry, "A Douglas! A Douglas!" the assailants burst into the castle, slaying the sentries and pouring down upon the startled revellers. Fienne and his men fought gallantly for a time, but at length all surrendered, with the exception of the governor himself and a few of his immediate followers, who retired into a tower, where they defended themselves until the following day; then Fienne being seriously wounded, the little party also surrendered. As Douglas had no personal quarrel with the garrison of Roxburgh such as he bore with those who occupied his ancestral castle, he abstained from any unnecessary cruelties, and allowed the garrison to withdraw to England, where Fienne soon afterwards died of his wounds.