La Peña originally intended to take the right-hand road, and ordered Beguines, who was now in the high hills to the east, about Ximena, to join him with his roving brigade at Casas Viejas. The column left Facinas late in the evening, for La Peña had a great and misplaced belief in night marches, by which he always hoped to gain time on the enemy, since his moves could not be discovered or reported till the next morning. He overlooked the corresponding disadvantage of the extreme slowness of progress over bad roads in rugged country, the very real danger that the troops (or some of them) might miss their way in the dark, and the inevitable fatigue to the men from losing their proper hours of sleep. Graham’s laconic diary shows how this worked out. ‘Marched in the evening, very tedious from filing across water (the stream which fills the head of the lagoon of La Janda) and other difficulties. Misled by the guides on quitting the Cortigo de la Janda (farm at the head of the lagoon): the counter-march made a most fatiguing night.... It was twelve noon before the troops halted, having been nineteen hours under arms.’ The troops of Lardizabal, at the head of the column, had reached Casas Viejas in the morning, but the English division in the rear of the army had got no further than the northern end of the lagoon, some thirteen miles from their starting-place at Puente de Facinas. There was a violent east wind, the night had been very cold, and the men were much fatigued. Lardizabal on reaching Casas Viejas had found the convent, which was the only solid building there, occupied by a French post, two companies sent out by General Cassagne from Medina Sidonia to watch the high-road. Thinking at first that he was only about to be worried by guerrilleros, the French captain shut himself up behind his barricades, instead of retreating at once. When he found out his mistake, and saw that a whole army was about him, it was too late to get off without loss. La Peña ordered that the convent should be left alone, as he did not wish to waste time in battering and storming it. The whole of his troops had come up, including the roving force of 1,600 men from the hills under Beguines, when the French unwisely made a bolt eastward, in the hope of escaping. The little column was pursued and cut up by a squadron of Busche’s German Hussars, many being killed and captured. From the prisoners and Beguines’s scouts La Peña learnt that Medina Sidonia was (contrary to his expectation) held by a serious force of French--Cassagne’s detachment being now composed of five battalions of infantry, a battery, and a cavalry regiment, about 3,000 men. The walls had been repaired, it was said, and the place was in a state of defence.