The two divisions of Lamas and Vergara now remained to continue the siege, with about seven hundred cavalry: but from that time the enemy were unable to keep it closely, for the Republicans made sorties now and then, sometimes bringing in oxen or wild horses, and that kept our cavalry in a pretty good condition, who had lost almost all their horses, in consequence of the strictness of the siege. It is to be observed, that the horses of that part of the country are not accustomed to eat anything but grass, being pastured in the open fields; and therefore but few are fed with hay and grain. In those days an operation was performed by the Republicans, of a superior kind. Garzon, who had been at Concordia, opposite Salto, had marched, to unite with Urquiza, for Corrientes, under the orders of the latter General; but a cavalry corps of observation remained at Concordia. The sentinels of that body were visible from Salto, and their _cavalcade_, or troop of horses, went every day to the river's bank to feed, (probably finding better pasture,) and at night returned. A plan was formed to capture those animals; and one day about twenty men prepared, naked, and with nothing but their sabres; while a company of Legionaries, divided among the vessels of the flotilla, waited, ready to embark in the boats. About mid-day, when the sun shone hottest, the enemy's sentinels were lying on the ground, having made a shelter of their ponchos, and were fast asleep. The river, at the place where it was to be crossed, was only about five hundred paces wide, and not guarded. The appointed signal was given, and the cavalry soldiers marched from behind their coverts on the shore, and threw themselves into the water, while the Legionaries leaped into the boats; and, when the sentinels awoke, they heard the bullets of their active assailants whistling about their ears; and the amphibious centaurs pursued them along the hill. Only the brave South American cavalry are capable of performing such an enterprise. Being excellent swimmers, both men and horses, they can cross a river several miles wide, the men holding by the tails of their animals, or by their manes, and carrying their arms and baggage in their _pelottas_, which are made of the _curona_, a piece of leather, which forms a part of the harness. Some of the cavalry remained on the hill, watching the enemy, while the others collected their horses which were scattered about the pasture, and led them to the shore, where they hurried them into the water, and got most of them over to the other side. Some of the enemy, who resisted, were bound and carried across by the vessels. In the meantime the Legionaries exchanged a few shots with the enemy, who were increasing their numbers, but did not feel strong enough to charge them. Thus, in a few hours, more than a hundred horses were obtained by the Republicans, without having a single man wounded.