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. [Illustration: MONTEVIDEO AND THE CERRO HILL.] [Illustration: "AFTER CATTLE." To face p. 88.] From that moment Artigas became virtual king of a torn and struggling realm. The Buenos Aires authorities, incensed at his defection, placed a price of six thousand dollars on his head, continuing meanwhile the siege of Montevideo. Artigas retaliated by a formal declaration of war upon the central Government. The hostile ramifications were now sufficiently involved to satisfy the most warlike spirit. Artigas was fighting the Buenos Airens and Portuguese, and was only prevented from coming to close grips with the Spaniards by the fact that the intervening Buenos Aires armies had already taken that task upon themselves. As it was, the influence of the national hero spread out to the west with an amazing rapidity, passing beyond the Uruguay River, and holding good upon the remote side of the great Paraná stream itself. In a very short while his dominions in Argentine territory assumed an extent four times greater than that of his native country. The provinces of Entre Rios, Corrientes, Santa Fé, and Córdoba welcomed his new tricolour standard with enthusiasm. Thus Artigas was now ruler of 350,000 square miles, with the exception of the various odd points of vantage held by the remaining three contending powers.