He set off at once upon a furious campaign against the strongholds of the unruly barons. “No mountain-side however steep and rugged, no tower however lofty and impregnable, availed to check his advance, as skilful as it was daring, as steady and persevering as it was impetuous.”[976] By midsummer the castles of Poitou itself were mostly in his hands, and the young conqueror was busy with the siege of Castillonnes-sur-Agen, which surrendered to him in the middle of August.[977] Before the winter was over he was master of Périgueux, and had, in the phrase of a local writer, well-nigh “disinherited” the barons of Périgord, the Quercy and the Limousin. But in the spring their smouldering resentment was kindled into a blaze by the incitements of Bertrand de Born, whose brother Constantine, expelled by him from the castle of Hautefort which the two brothers had inherited in common, had appealed to Richard for succour; the signal for revolt, given by Bertrand in a vigorous _sirvente_, was answered by all the malcontents of the district,[978] and at the opposite end of Poitou by the count of Angoulême; and at Easter Richard found his position so difficult that he went to seek advice and reinforcements from his father in England.[979] Geoffrey of Britanny arrived at the same time on a like errand. Henry bade his eldest son go to the help of the younger ones; the young king complied,[980] somewhat unwillingly, and went to collect forces in France while Richard hurried back into Poitou. The peril was urgent; in his absence Count Vulgrin of Angoulême had invaded Poitou at the head of a host of Brabantines. The invaders were however met and defeated with great slaughter at Barbezieux by Richard’s constable Theobald Chabot and Bishop John of Poitiers.[981] By Whitsuntide Richard had gathered a sufficient force of loyal Poitevins and stipendiaries from the neighbouring lands to march against Vulgrin and his Brabantines and defeat them in a battle near the border of the Angoumois and Saintonge. He then turned upon the viscount of Limoges, besieged and took his castle of Aixe, and thence advanced to Limoges itself, which he captured in like manner. At midsummer he was rejoined at Poitiers by his elder brother, and the two led their combined forces against Vulgrin of Angoulême.[982] A fortnight’s siege had however scarcely made them masters of Châteauneuf on the Charente when the young king--seduced, it was said, by some evil counsellor whom we may probably suspect to have been Bertrand de Born[983]--suddenly abandoned the campaign and withdrew again to France. Richard, undaunted by his brother’s desertion, pushed on to Moulin-Neuf and thence to Angoulême itself, where all the leaders of the rebellion were gathered together. A six days’ siege sufficed to make Vulgrin surrender himself, his fellow-rebels, his city and five of his castles to the mercy of the duke and the English king. Richard sent over all his prisoners to his