On the 14th, Sir Arthur reached Alcobaça, from which the French fell back the preceding night: the next day he arrived at Caldas. Laborde and Thomieres were now at Roliça, about ten miles off, and their advanced posts were within a league of the Caldas. Four companies of riflemen were ordered to drive them back; they were tempted to an incautious pursuit; a superior body of the enemy endeavoured to cut them off, and would have succeeded, had not General Spencer come to their support. A trifling loss was sustained in this affair, but the village was won, and the French retired entirely from the neighbourhood; their picquets having been driven from Obidos. ♦LABORDE TAKES A POSITION AT ROLIÇA.♦ The country between the Caldas and Obidos is a sandy level, with an open pine wood. Obidos itself stands finely upon an insulated hill, and a little beyond a mountainous or hilly region begins, the ascent from the low country being abrupt and difficult. Laborde had retired thither, knowing the strength of the ground, and expecting to be joined there by Loison, who, he knew, would make every exertion to effect his junction in time. That junction had once already been prevented by the timely arrival of the British at Leiria, and Sir Arthur now advanced for the ♦AUGUST 17.♦ purpose of a second time preventing it. The enemy were drawn up at the foot of the hill, in front of their position; they retired to the heights, and Sir Arthur, having reconnoitred the ground, and seen how difficult the attack in front would be, determined to attack both flanks. He therefore directed Major-General Ferguson, with 3000 men, to turn the enemy’s right, and Major-General Hill to attack the left, while the Portugueze troops, under Colonel Trant, by a wider movement on that side, were to penetrate to his rear. Meanwhile columns under Major-Generals Crawford, Nightingale, and Fane, were to assemble in the plain, ready to force their way up the passes as soon as it should be seen that the enemy were shaken. This plan, which would have ensured success with the least possible loss, was frustrated by some mistake in the delivery of an order. Ferguson’s brigade was, in consequence of this error, brought into the plain to support the central movement; and the attack was made in front, upon the strength of the position, before the enemy apprehended any danger on the flanks or in the rear, and consequently while they were able to apply their whole force and undivided attention where they were strongest.