At last the Paraguayans were almost all killed or wounded, and those who could move pushed off in their canoes, some paddling with one arm who had the other one wounded. The daylight had appeared, and they were forced to stem a heavy current, under the fire of the Brazilian vessels, at close quarters; and yet fifteen canoes got back to their own shore.
The Paraguayans lost fourteen officers killed, and seven wounded. Of the soldiers three hundred returned, almost all wounded, and they left five hundred men on the bank, or bar. Among the prisoners taken by the Brazilians was a Lieutenant Roméro; and Lopez forced his wife to write a letter disowning him as a traitor to Paraguay, because he had allowed himself to be taken alive.
In this affair the Brazilians lost about a thousand, killed and wounded, many more than the whole attacking force. The fire of their own steamers destroyed a number of these.
Six Brazilians were afterwards tried for cowardice in this engagement, and were shot.
In February, 1868, the Brazilian iron-clad vessels succeeded in passing Humáitá, the extensive works above the confluence of the rivers, which had so long kept them in check.
On the 13th three new monitors had arrived from Rio Janeiro, and joined their squadron. They were built in Rio Janeiro, and had twin screws, with four inches of iron on the hull, which was only one foot out of the water, when prepared for action in fresh water. They had each one revolving turret, six inches thick, with one heavy Whitworth gun in each. The circular port for the gun was barely larger than the muzzle, and when run out was flush with the face of the turret. Elevation and depression of a gun so placed was obtained by means of a double carriage, which raised or lowered the trunnions.
On February 18th everything was ready, and at half past three in the morning the Brazilians began to bombard the Paraguayan works most furiously.
The large casemate ironclads, each with a monitor lashed alongside, then steamed up to the batteries at Humáitá. The fire of these batteries was well sustained, and true, as the Paraguayan fire had always been, but their cast-iron shot flew to pieces on the armor of the ironclads, which passed without serious damage. After passing the works they continued straight on, past more batteries, at Timbó, to Tayi. The batteries at Timbó were water batteries, and injured the ironclads more than all the others they had passed. In this passage one of the Brazilian monitors received no less than one hundred and eighty shot; and another one was hit one hundred and twenty times. Their plates were dented and bent, and the bolts started, but there was little or no loss of life on board them.
If one or two of the Brazilian ironclads had remained between Humáitá and Timbó, instead of all running by the latter place, the works of the former would have been really closely invested; and as the object of running the batteries was to cause the surrender of Humáitá, the movement was to that extent a failure. The Paraguayans evacuated their works at their leisure, taking guns and stores.