The fruits of these successes were lost by the signal overthrow and practical annihilation of a large Chinese army at Taitsan. One of General Staveley's detachments was cut off, and with his communications threatened he found himself compelled to abandon Kahding, and to retire towards Shanghai. Tsingpu had also to be abandoned, and the garrison suffered some loss in effecting its retreat. Of the first results of General Staveley's campaign there thus remained very little, and it was only in the autumn that these places were retaken, and the campaign against the Taepings in the Shanghai districts continued with varying fortune throughout the remainder of the year 1862 and the early months of 1863. While these military events were in progress Major Gordon, who was raised to the rank of Major in the army in December 1862 for his services in China, had been trusted with the congenial task, and one for which he was pre-eminently well suited, of surveying and mapping the whole of the region for thirty miles. This work, necessary in itself for many reasons, proved of incalculable value to him in the operations which he eventually undertook and carried out to a successful issue against the rebels. His own letters show how thoroughly he fulfilled his instructions, and how his surveys ended in his complete mastery of the topography of the region between the Grand Canal, the sea, and the Yangtsekiang:-- "I have been now in every town and village in the thirty miles' radius. The country is the same everywhere--a dead flat, with innumerable creeks and bad pathways. The people have now settled down quiet again, and I do not anticipate the rebels will ever come back. They are rapidly on the decline, and two years ought to bring about the utter suppression of the revolt. I do not write about what we saw, as it amounts to nothing. There is nothing of any interest in China; if you have seen one village you have seen all the country. I have really an immensity to do. It will be a good thing if the Government support the propositions which are made to the Chinese.