At length the Portuguese peril loomed sufficiently large to outweigh every other consideration. With a view to stemming the foreign tide of invasion, the Buenos Airens patched up a treaty with the Spanish troops in Montevideo. The despairing measure was doubtless one of necessity, but it aroused deep passion in the mind of the Uruguayan leader, who protested that his country was forsaken, and given over once again to the mercies of the Spaniards. Collecting every available man, woman, and child, he led them to the north-west, and passed the great exodus over the River Uruguay to a haven of safety at Ayui, upon the Entre Rios shore. Meanwhile, Uruguay was overrun by the invading Portuguese and by the released Spaniards, who eddied out in all directions from Montevideo.

Artigas was now encamped for the first time with a translated nation and an independent army of his own. The condition of both was grimly tragic, pathetically humorous. For fourteen months almost the only shelter, that served for all alike, was afforded by the branches of the trees and the boards of the carts that had brought them. As for the army, it was composed of strangely heterogeneous elements. Honest countryfolk rubbed shoulders with professional criminals and cut-throats; Indians from the destroyed Jesuit missions went side by side with fierce-faced Gauchos; while townsmen, negroes, and a few adventurous foreigners made up the mixed gathering.

The men were in deadly earnest, since the example of Artigas seems to have inspired even the most depraved with a spark from his own fire. Had it been otherwise they would undoubtedly have succumbed to the disadvantages with which they had to contend. Arms were scarce. A certain favoured few were possessed of muskets and swords; but the weapon in chief use was the lance, the national arm of River Plate folk, the point of which, here at Ayui, was usually fashioned from the blade of shears or a knife, or from the iron of some other agricultural instrument. Many, however, had perforce to be content with a long knife, with the lasso and the sling—the boleadores—as subsidiary weapons. Yet even these proved by no means despicable in the hands of the men whose sole garment was the ragged remnant of a poncho tied about the waist, and who exercised with poles in preparation for the time when a musket should be in their hands.

It was with the aid of an army such as this that Artigas would cross the river to make his incursions among the hills of his native country, and would engage Portuguese and Spaniards alike in battles from which the desperate and motley companies of men would frequently emerge victorious. Artigas was now assisted by numerous minor chiefs, many of whom were of a character quite unfitted to stand the light of day. Otorques and Andresito were the most noted of these. The methods of the former were utterly brutal. Although the fact is contradicted, he is credited by many with the order to a subaltern officer to "cut the throats of two Spaniards a week in order to preserve the morale. Failing Spaniards, take two Buenos Airens for the purpose"!

Andresito was an Indian from the deserted Jesuit missions who commanded a considerable force of his own race. He appears to have interspersed his dark deeds with some evidence of better qualities and even of a grim humour. A coarse instance of this latter is supplied when he entered the town of Corrientes in the heyday of Artigas's power. On this occasion the Indian troops behaved with no little restraint towards the terrified inhabitants, and contented themselves with levying contributions towards the clothing of the almost naked army. This accomplished, Andresito determined to exhibit the social side of his temperament. He organised several religious dramas, and followed these by a ball in honour of the principal residents of the town. These, however, failed to attend, their reluctance to dancing with Indians overcoming their prudence. On learning the reason from some crassly honest person, the enraged Andresito caused these too particular folk to be mustered in the main plaza of the town. There he obliged the men to scour the roadway, while the ladies were made to dance with the Indian troops.

Although no merit or subtlety can be claimed for such methods, they at all events stand apart from the rest in their lack of bloodthirstiness. Compared with the sentiments revealed in a proclamation of Otorgues in taking possession of Montevideo, the procedure at Corrientes seems innocuous and tame. One of the clauses of this document decrees the execution within two hours of any citizen who should speak or write in favour of any other government, while the same fate was promised to one "who should directly or indirectly attack the liberty of the Province"! The humour in the employment of the word "liberty" is, of course, totally unconscious.

Such proclamations, naturally, served purely and simply as a licence for convenient murder. Employing lieutenants of the kind, it is little wonder that much of the guilt of their accumulated deeds should be undeservedly heaped upon Artigas's head. Not that the Commander-in-Chief himself was inclined to put a sentimental value upon human life; indeed, a delicacy on this point would be impossible in one who had passed through the scenes of his particular calling. In any case his hatred of robbery was deep-rooted and sincere. After the execution of three criminals of this type, he proclaims to his people at Ayui: "My natural aversion to all crime, especially to the horrible one of robbery, and my desire that the army should be composed of honourable citizens ... has moved me to satisfy justice by means of a punishment as sad as it is effectual." A little later he makes a similar appeal, adding, "if there be remaining amongst you one who does not harbour sentiments of honour, patriotism, and humanity, let him flee far from the army he dishonours"! Here we get the flowers of the south, earnestly thrown, but alighting in too earthy a bed! The poor army, with its impoverished, ragged loin-cloths, and with its lassos and slings, undoubtedly valued the occasional luxury of a full stomach at least as highly as the abstract virtues. Yet they probably heard the words with sincere admiration, feeling an added pride in their beloved leader who could employ such phrases. In any case—whether as a result of punishments or proclamations—the crime of robbery soon became rare almost to extinction within the sphere of Artigas's influence.

The war itself was each month growing more savage in character. Such virtues as the Uruguayan army possessed were recognised least of all by the Spaniards. Elio, the Viceroy, had erected a special gallows in Montevideo for the benefit of any prisoners that might be captured, while Vigodet, his successor, endeavoured to strike terror by measures of pure barbarity. By his order a body of cavalry scoured the countryside, slaying all those suspected of Artiguenian leanings, and exposing the quartered portions of their bodies at prominent places by the roadside. Each patriot, moreover, carried a price upon his head. It is not to be wondered at that the Uruguayan forces made reprisals, and that corpses replaced prisoners of war.

A renewed campaign waged by the Buenos Aires forces against the Spaniards was the signal for the abandonment of the settlement at Ayui. Once again the Royalists were shut up within the walls of Montevideo, and at the beginning of 1813 Artigas, with his men, marched down from the north to take part in the siege. The Uruguayan came now as an assured ruler of his own people; the Buenos Aires commanders regarded him as a unit in a greater system. The result was the inevitable quarrel, and a year from the inception of the operations Artigas took the most decisive step in his career. He gave no warning of his move. The evening before had witnessed his particular portion of the field covered with horses and men. The next morning saw the ground bare and deserted: Artigas and his army were already many leagues away.