The 23d the infantry renewing their march crossed the Pisuerga, at Cordovillas, and Torquemada, a little above and below its junction with the Arlanzan; but while the main body made this long march, the French having passed Burgos in the night of the 22d, vigorously attacked the allies’ rear-guard. This was composed of the cavalry and some horse artillery, commanded by Norman Ramsay and Major Downman; of two battalions of Germans under Colin Halket; and of the Partidas of Marquinez and Sanchez, the latter being on the left of the Arlanzan and the whole under the command of sir Stapleton Cotton. The piquets of light cavalry were vigorously driven from the bridge of Baniel as early as seven o’clock in the morning; but they rallied upon their reserves and gained the Hormaza stream which was disputed for some time, and a charge made by captain Perse of the sixteenth dragoons, was of distinguished bravery. However the French cavalry finally forced the passage and the British retiring behind Cellada Camino took post in a large plain. On their left was a range of hills the summit of which was occupied by the Partida of Marquinez, and on their right was the Arlanzan, beyond which Julian Sanchez was posted. Across the middle of the plain run a marshy rivulet cutting the main road, and only passable by a little bridge near a house called the Venta de Pozo, and half-way between this stream and Cellada there was a broad ditch with a second bridge in front of a small village. Cotton immediately retired over the marshy stream, leaving Anson’s horsemen and Halket’s infantry as a rear-guard beyond the ditch; and Anson to cover his own passage of that obstacle left the eleventh dragoons and the guns at Cellada Camino, which was situated on a gentle eminence. COMBAT OF VENTA DE POZO.