The works at Anunghoy consisted of two very strong, heavy batteries, built of excellent granite, and partly of the composition called chunam. The masses of stone were afterwards found to be of immense size, so much so, that it was no easy task to blow the works to pieces, even after they were taken. The two principal batteries were connected together by temporary works of recent construction; and according to the usual Chinese practice, a semicircular wall was carried round the rear of each fort along the side of the hill. The breadth of the river from Anunghoy to the opposite side is from two to three miles, being somewhat less than it is lower down between Chuenpee and Tycocktow. But in the very middle of the river in this part are two rocky islands, called North and South Wantung, of moderate elevation, and also a smaller rock, scarcely visible at high water. Hence there are two channels up the river, one on either side of these islands, but that on the east side towards Anunghoy is the one which had always been frequented by foreign ships, and was considered to be the Bocca Tigris, or Bogue. The passage on the western side of Wantung was not only not frequented by Europeans, but not even known to be navigable, until our preparations were made for the capture of the Bogue forts, when some of our ships passed up on that side to the attack of North Wantung. The true Bogue, or eastern passage, is only about three quarters of a mile wide; the current, or rather the tide, is very rapid, on which account ships generally prefer keeping rather near to the Anunghoy side. Of the two islands called Wantung, the northern is the highest and largest, lying quite opposite Anunghoy, and was very strongly fortified. South Wantung, the smaller island, was not fortified by the Chinese, being not considered by them of sufficient importance to require it. It lies some distance lower down the river, and looking at their relative positions, you would hardly suppose they were within effectual gun-shot distance from each other. Such, however, was the case; and the Chinese forts on North Wantung were shelled from South Wantung by a small battery, constructed by a detachment of our troops in a single night, being covered during their work principally by the Nemesis, which ran close in shore for that purpose, being herself sheltered by the island.