Don Juan Martin Pueyrredon, now President of the United Provinces, had already so far adopted the military ideas of San Martin, that on the 16th June he had given orders for the despatch of men and arms to Cuyo, but San Martin was not content with mere acquiescence in his plans, he wanted the hearty approval and concurrence of the Chief of the State. He accordingly left Mendoza for Cordoba on the 15th July, and there met the President. The conference lasted three days and resulted in a complete understanding between them.

Then as no maps existed of the passes of the Andes, he sent his aide-de-camp Condarco, who was a skilful engineer, with a copy of the Declaration of Independence to the Governor of Chile.

“But,” he said to him as he gave him his instructions, “your real errand is to reconnoitre for me the roads by Los Patos and Uspallata. Without making a note, you must bring back in your head a plan of them both. I shall send you by Los Patos which is the longest road, and as they are certain to send you back at once, if they don’t hang you, you will return by Uspallata, which is the nearest way.”

As San Martin had anticipated, the copy of the declaration which Condarco presented to Marcó del Pont, was burned by the public hangman of Santiago, and the messenger was sent back at once with scant courtesy, but in his receptive brain he brought with him plans of both roads, which he drew out on paper at his leisure, and these plans so obtained, became the chart of the first operations of the Army of the Andes.

In the early spring, San Martin brought the various corps of his army from their cantonments, and encamped them on an open plain about a league to the north of Mendoza, where the recruits were thoroughly drilled, and the whole force was taught to act in concert. Every hour of the day had its allotted work, and in the evening the officers attended classes for instruction in tactics. To complete its organization, a printing press was added to the stores, from which bulletins of victory were to issue to the world, teaching to the liberated people the principles of the Argentine revolution, which the soldiery supported with their bayonets.

On the 17th January, 1817, there was high holiday in the city of Mendoza. The streets and plaza were decorated with flags and streamers. The whole army marched in to salute the Virgen del Carmen as its patron saint, and to receive a special army flag embroidered by the ladies of the city. When the usual formalities were over, San Martin ascended a platform in the great square with the flag in his hand, and waving it over his head, said in a voice which could be heard by all:—

“Soldiers! This is the first independent flag which has been blessed in America.”

One great shout of “Viva la Patria!” rose from the people and the troops in answer.

Then he added—

“Soldiers! Swear to sustain it and to die in defence of it, as I swear to do.”