Mr. Brooke's most terrible assailants were the Sakarran and Sarebus pirates, two tribes of freebooters whose seats of power were on the Sarebus and Batang Lupar rivers, two streams fifty or sixty miles east of Sarawak. These tribes were encouraged and secretly helped by his own Malay chiefs, and insolently defied his power, continuing their depredations, capturing every vessel which ventured out, and ravaging all the adjacent coasts. The strength of these confederacies was so great, that it was no unusual thing for them to muster a hundred war-boats; and they had built, on the banks of the rivers which they infested, strong forts at every point which commanded the channel. That the new Rajah was not able with his slender resources to curb these sea-robbers is not surprising. The only wonder is, that he was able to protect his own capital from the assaults which they often threatened but never dared to attempt. But efficient aid was at hand. In the summer of 1843 the British ship Dido anchored off the entrance of Sarawak River. She was commissioned to suppress piracy in and about the Chinese Sea. Her commander readily entered into the views of the English Rajah. A boat expedition against the strongholds of the Sarebus pirates was projected. Mr. Brooke assisted with seven hundred Dyaks. A curious incident occurred, showing how clearly the natives appreciated their dependence on their English friend. When he asked their chiefs if they would aid him, they besought him not to risk his life in so desperate an enterprise. But when he assured them that his purpose was fixed, that he should go, alone if necessary, they replied: "What is the use of our remaining behind? You die, we die; you live, we live. We will go too." The expedition was perfectly successful. Three fortified villages were stormed, many guns spiked, many boats destroyed, and their defenders driven to the jungles. This chastisement not sufficing, in the following year another expedition from the same vessel attacked the Sakarran pirates and inflicted upon them a punishment even more severe than that which had fallen to the lot of their Sarebus brethren. Six forts, one mounting fifty-six guns, scores of war-boats, and more than a thousand huts, were burned. These lessons, though sharp, did not permanently subdue.