On the morning of the 6th the French retired behind the Saltillo river, leaving the 3rd Division (now commanded by Cassagne, for Villatte had been wounded) on the further side, with orders to retire when seriously attacked, and to issue a signal for the blowing up of all the forts of the south wing of the Lines, at the moment that the retreat should begin. Cassagne was then to rejoin the Marshal behind the Rio San Pedro, beyond Puerto Real, skirmishing as he went. But no trace of the Allies was to be seen on the morning of the 6th, and Cassagne was not forced to move back, though by mistake one battery was blown up without the signal being given[163]. The only sign of life on the part of the enemy was that a swarm of English gunboats and launches appeared at the north end of the lines, and threw ashore 600 seamen and marines, who occupied Puerto Santa Maria for some hours, and destroyed all the smaller batteries between that place and Rota unhindered. For the French had concentrated in the fort of Santa Catalina and abandoned all their minor posts. But the flotilla withdrew at dusk, leaving Victor much puzzled as to the purpose of his adversaries. On the morning of March 7th he sent out a cavalry reconnaissance of several squadrons, which brought back the astonishing news that it had explored the whole of the country between Chiclana and the sea, including the battlefield, and had seen no hostile troops, save a large encampment on the Bermeja isthmus, just above the bridge of boats leading into the Isla de Leon. [163] See, for a curious note concerning this incident, Lapéne, Appendix, p. 256. What had happened was that La Peña had determined to give up the expedition and retire to Cadiz. He had declined to listen to a proposition made by Graham and Admiral Keats that he should advance cautiously towards Chiclana, while the British naval and land forces made a combined attack upon the Trocadero[164]. He did not even send out cavalry patrols to discover what had become of Victor; if they had gone forth, they would have found that the Marshal had retired beyond the Saltillo, and would have discerned his preparations for a general retreat. But after remaining encamped by the Torre Bermeja during the whole of the 6th and the greater part of the 7th, the Spanish army crossed the bridge of boats into the Isla, and took it up behind them. Only Beguines and his three battalions were left on the continent, with orders to return to their old haunts in the Ronda mountains. This little force retired to Medina Sidonia on the 8th, and repulsed there a French column of 600 men which came up to occupy the town. But next day a whole brigade marched against them, whereupon Beguines evacuated Medina and went off towards San Roque and Algesiras.