Early in 1818, the supreme chief, after concentrating his forces, marched rapidly to Calabozo, and arrived before Morillo was aware that he had quitted Angostura. The Spanish general effected his retreat to Aragua. The supreme chief came up with him at La Usirrael, but could make but a slight impression on the enemy, on account of the strength of his position. Another rencontre occurred at Sombrero. Morillo retired to Valencia; and Bolivar took possession of the valleys of Aragua. Thence he detached a strong division to take San Fernando de Apure, in order to complete the conquest of the Llanos. Upon this the Spaniards advanced. The two armies met at Semen. Morillo was wounded, and the royalist army put to flight. The pursuit being indiscreetly conducted by the patriots, and a fresh royalist division arriving to support Morillo, the fortune of the day was changed. Each party was alternately defeated, and both rallied their dispersed corps to reengage at Ortiz. The division which succeeded in capturing San Fernando had an indecisive affair at Cojedes. Others of the same character took place at El Rincon del Toro, and other places. At the close of this campaign, the Spaniards held Aragua, and the patriots San Fernando. Thus the former possessed the most fertile provinces of Venezuela, and all New Granada; while the latter were reduced to the Llanos and Guayana. Arms were sent to General Santander, who was endeavouring to raise a division in Casanare. In 1819, the various corps united in San Fernando, where the supreme chief devoted his labours to the regulation of civil affairs. He invited the provinces to send deputies to Angostura, to form a general congress, and then delegated his powers to a council of government to act in his absence. With four or five thousand men, the supreme chief opened the campaign against Morillo, who had six or seven thousand. Twelve hundred British troops arrived at Margarita from England. They had been engaged in London by Colonel English, and were equipped and sent out by Messrs. Herring and Richardson; besides these, eight hundred others also arrived at Angostura. The latter were engaged by Captain Elsom, and sent out by Messrs. Hurry, Powles, and Hurry; the greater part were disbanded soldiers from the British army, reduced on the return of the troops from France.[4] These volunteers were equipped in the most efficient manner. With these expeditions large supplies of spare arms were sent to assist the cause of independence. Bolivar, in his speech to congress, thus expresses himself on this subject:-- [4] Colonel Macirone also sent out above two thousand men, who were employed in the capture of Porto Bello and Rio de la Hacha. This caused a very favourable diversion for Bolivar in Venezuela, as it distracted the attention of the royalists, and but for the pusillanimous conduct of Macgregor, who commanded the expedition, might have proved of lasting advantage.