Brion, with the title of Admiral of Venezuela, took command of the squadron, which sailed from Cayos on the 16th March, 1816. The expedition consisted of 300 men, whom Bolívar afterwards compared to the 300 Spartans of Leonidas, as he compared his reconquest of Venezuela to the redemption of Jerusalem by the Crusaders. They reached the island of Margarita early in May, finding there the Spanish brig Intrepido and the schooner Rita, which Brion boarded and captured, after a desperate resistance in which three-fourths of their crews were killed. The expedition then disembarked at the port of Juan Griego, the Royalists concentrating their forces at Pampatar and Porlamar.

Bolívar and Arismendi then conjointly convened a meeting of the officers of the Patriot army, and of the principal inhabitants, in the church at La Villa del Norte, in order to name the supreme ruler of the Republic they were about to restore. In accordance with his custom, Bolívar immediately renounced all pretensions to so important a post, which, as he had already arranged the matter with Arismendi, was merely one way of securing his own appointment. On the 7th May he was named “Supreme Chief,” with power to do whatever he might find necessary for the salvation of the country. Mariño was named second in command.

On the 8th May Bolívar published a proclamation to the people of Venezuela, announcing that the National Congress would be reinstalled, and authorising the free towns to elect deputies, who should have the same sovereign powers as in the former epoch.

The expedition, reinforced by four ships from the island, then went on to Carupano, on the coast of Paria, capturing two armed vessels of the enemy and the fort, which was abandoned by the garrison. Here Bolívar established his head-quarters on the 1st June.

Rumour had greatly exaggerated the strength of the force he brought with him, but Bolívar made small use of the stupor into which the Royalists were thrown. He detached Piar to Maturin and Mariño to Güiria, but remained himself at Carupano, issuing pompous bulletins, in which he renounced his former system of a war of extermination, as a mistake. Also, in fulfilment of a promise to Petión, he published a decree giving liberty to all slaves, and called the people to arms, but no one joined him. He then convened an assembly of the townsfolk, who at his suggestion decreed the centralization of the powers of government. The federal system was abolished in Venezuela.

But a month of precious time was thus lost. Twenty days after the disembarkation, his advanced posts were driven in, and he was besieged by a division of 1,300 men, while a Spanish squadron threatened his communications by sea. Mariño sent him a strong reinforcement, but Brion refused to risk his ships in an unequal fight with the Spanish squadron. Meantime the guerilla leaders of the East proclaimed him general-in-chief, and desired his presence.

Rejecting the advice of Piar to occupy Guayana as a base of operations, he re-embarked his small force, and again landed on the 5th July at Ocumare, between Caracas and Puerto Cabello. This step can only be explained by his anxiety to rescue his native city from the Royalists, a preoccupation which was to cost him the loss of three campaigns. Again rejecting the advice of his officers, who wished to effect a junction with the guerillas and so form an army, he detached Soublette with the bulk of his men to occupy the pass of Cabrera, and a smaller force along the coast in search of recruits, while he landed a printing press and issued more bulletins, and Brion went off on a cruise leaving him one armed brig and two small schooners.

On the same day on which Bolívar landed at Ocumare, Morales reached Valencia, with the division detached by Morillo after the surrender of Cartagena. In the face of such a superior force, Soublette was compelled to retire to a strong position on the heights of Ocumare. Bolívar went to his assistance with 150 recruits, but the combined force was completely routed by Morales on the 13th July.

MacGregor was then sent off with a detachment southwards to Choroni, while Soublette protected the retreat of Bolívar with the artillery to Ocumare, where he intended to re-embark. While engaged at night in this operation, he received word that the enemy were entering the town. It was a false alarm, Soublette still held his ground, but his men were panic-struck, and Bolívar, without inquiring into the truth of the report, abandoned his sick and wounded, and fled on board the brig where his stores of war material were already in safety. He sailed at once and reached the island of Bonaire on the 16th July. Here he was joined by Brion, and sailed with him for Choroni, where he learned that Soublette and MacGregor had marched inland and had taken refuge in the valleys of Aragua. Returning to Bonaire he there met Bermudez, and with him sailed off to join Mariño at Güiria.

Soublette and MacGregor had joined forces at Choroni, the latter taking the command. Two days he waited for news of Bolívar and then marched off for the plains with 600 infantry and 30 horse. Dispersing a Royalist detachment which attempted to bar the passage of the hills, he occupied Victoria and routed another detachment under Rosete. On the 1st August he was met by a squadron of Saraza’s guerillas, who were in search of him, and on the 2nd August routed another division of 1,200 Royalists at Quebrada-Honda. The next day he was joined by Saraza and Monagas with their divisions of guerillas, and was master of the plains of Barcelona, while Cedeño held his ground on the Upper Orinoco. So was formed the army which was afterwards known as “the Army of the Centre,” which, in conjunction with that of the Apure, decided the destinies of Venezuela. Of this army MacGregor was recognised as general-in-chief.