But Wellington merely waited to mature his preparations; and, to extend his line of supply, he determined to seize the strong ground between the Nive and the Adour, and confine Soult to the immediate vicinity of his own camp. Accordingly, on the 9th of December, the left wing of the allies, advancing by the road of St. Jean de Luz, gained the heights domineering the intrenchments of the French. The right forded the Nive above Cambo, while, by a bridge of boats, Clinton crossed at Nostariz, and obliged the enemy, to avoid being cut off, to fall back on Bayonne. At night, the French having retired to their posts within the fortified position they had occupied, Hope, with the left of the allies, recrossed the river to his former cantonments, having a direct communication open with Sir Rowland Hill, who had taken a position with his division, his right on the Adour, his centre in the village of St. Pierre, and his left appuied on the heights of Ville Franque. Morillo’s division was in observation at Urcuray, and a cavalry corps at Hasparren. The relative positions of the rival armies were greatly different. Soult possessed immense advantages; his _corps d’armée_ were completely bivouacked, with easy communications, every facility for rapid concentration, and the citadel of Bayonne to protect him if he found it necessary to fall back. The allies extended over an irregular line intersected by the Nive, with bad roads, that rendered any rapid reinforcement of a threatened point altogether impracticable. Hence, Wellington was everywhere open to attack, and Soult could fall on him with overwhelming numbers and force an unequal combat, while but a part of the allies should be opposed to the combined efforts of the enemy. The French marshal was aware of this, and it was not long before he endeavoured to profit by his advantage. The left of the allies, under Sir John Hope, had the fifth division (Hay’s) posted on the heights of Barouillet, with Campbell’s Portuguese brigade on a narrow ridge immediately in their front. At Arrangues, the light division was formed on a strong height, at a distance of two miles from the fifth. The positions were separated by the low grounds between the hills, and the corps were consequently unconnected. Although both were strongly posted, still, in case of an attack, each must trust entirely to his own resources, and repulse the enemy without counting on support from the other.