On the 20th of August we came to an anchor at the mouth of the Sarawak river, where we remained three weeks completing some very important surveys. When our work was done, the captain, accompanied by several officers, went up the river. On our arrival at Kuchin, we found the Dido corvette, commanded by Captain Keppell, lying abreast of the town. We also found that Kuchin was at present nearly deserted, as the Dido's boats, with the Phlegethon steamer, and all the native war prahus which could be mustered, had proceeded with Mr. Brooke to the Sakarron, a neighbouring river, to punish some of the mixed tribes who had lately been detected in an act of flagrant piracy. On the change of the tide we started for the Sakarron, with the hope of gaining the Dido's boats, and rendering them some assistance. Our men exerted themselves to the utmost; but it requires time to pull eighty miles; and I will therefore, _en voyage_, explain more fully the cause and the object of the expedition. The river Sakarron, with its tributaries, the Linga and Serebis, have been for a long while in the possession of a proverbial piratical tribe of Malays, governed by chiefs, who are of Arab descent, and much better acquainted with the art of war than those lawless communions are in general. Their towers and fastnesses on the banks of their rivers they have contrived to fortify in a very superior manner. Living wholly by the proceeds of their piratical excursions, and, aware of the efforts made by the European rajah, Mr. Brooke, to put it down, they resolved to take the first opportunity which might offer to show their hostility and contempt to their new-raised enemy. The occasion soon presented itself. Seven of the Kuchin Malays, having ventured in a canoe up the Sakarron river, were all murdered, and their heads cut off, and kept, as usual, as trophies; and the intelligence of this outrage communicated by them to Mr. Brooke, with defiance. Captain Keppell, of the Dido, had just arrived at Sarawak when this news was brought to Mr. Brooke. Captain Keppell had been sent by Admiral Sir Thomas Cochrane to the island on purpose to look out for pirates, and to destroy them and their nests wherever he could find them. He therefore gladly offered his assistance to Mr. Brooke to punish these murderous wretches; and the Phlegethon steamer coming in while they were preparing for the expedition, was, of course, added to the force employed. This fortunate accession of strength, assisted by all the Malay war boats which Mr. Brooke could muster, enabled them to give an effectual check to a band of pirates, so numerous and so warlike as to have become most formidable. To proceed:--