The allies now moved up the beautiful valley of the Pisuerga, from Valladolid, along the right bank of the river, to the place where it receives the Arlanzon; and then along both banks of the Arlanzon, up its valley towards Burgos. It is a tract of country in which nature seems to invite human industry, and man has not been negligent in profiting by the advantages of soil and climate and running waters. Every inch of the valley is cultivated, and the hills are on both sides covered with cornfields and vineyards. The country is as strong also in a military point of view as it is fertile; out of the high road in the valley the way is continually interrupted by rivulets and deep ditches: the hills on either side afford admirable flanks for the movements of an army, and there are heights from the river to the hills on either side for strong defensive positions. The French General was not a man to overlook this advantage, and the enemy were found on the 16th strongly posted with their left on the Arlanzon and their right on the mountains. Lord Wellington made arrangements to turn their position; but they decamped during the night, and in the morning their whole army was seen retiring in five columns along the valley, and the hills on either side. They were estimated at about 18,000 infantry and more than 2000 horse, and their line of baggage was longer and closer than men who had served in India had ever seen with an Indian army; for they had pressed all the cattle in the country, and left nothing transportable for any marauders who might follow them. Clausel entered Burgos on the evening of the 17th; Marmont and Bonnet, who were still incapacitated by their wounds, had left that city a few days before. Caffarelli came thither from Vittoria to confer with him: a council of war was held that night; at two in the morning the French commenced their retreat, and by ten o’clock they had left the city and the suburbs. ♦BURGOS.♦