Five days after Balmaceda's proclamation the congressionalist chiefs embarked on board the war-ships lying in Valparaiso Bay, and the civil war was on. The army remained faithful to Balmaceda and he was in undisputed possession of the whole country, although his opponents had powerful sympathisers everywhere. The latter's plan of campaign was simple. Once again power on the sea was to decide the fate of the Pacific coast. The navy sailed away to the nitrate provinces, a region separated from the rest of Chile by the impassable Atacama desert and to which, therefore, Balmaceda could not send re-inforcements. The small garrison under Colonel Robles made a desperate resistance, but was soon overpowered, and there the revolution established its base of operations. The population of sturdy miners, used to discipline under their bosses, furnished an admirable supply of recruits, and a revenue of two millions a month fell at once into the hands of the congressionalists. Possessing the sinews of war, it was only a question of a few months to equip an army with the most modern weapons and have it thoroughly drilled and organised by experts. The blockade of the southern ports intercepted Balmaceda's supplies and the congressionalist partisans escaped by hundreds to make their way up the coast and join the revolutionary army. By August they were ready with a force of more than ten thousand men. In the meantime Balmaceda had been making desperate efforts to get a navy, but iron-clads cannot be improvised, and the congressionalist agents in New York and Europe had money enough to outbid him and to command influences which effectually hindered prompt action. In Chile itself he adopted stern repressive measures against the plots of his enemies and vigorously recruited his army, putting into the field nearly thirty thousand soldiers. But the blockade prevented his procuring modern arms and they had to go into battle with old-style rifles whose range was only half that of those carried by their opponents. He was also at a disadvantage in that the enemy could strike where he pleased on a coast nine hundred miles long. Balmaceda was obliged therefore to keep his forces divided. Nine thousand were at Coquimbo, three hundred and fifty miles north of Santiago; as many at Concepcion, four hundred miles south of the capital; and five thousand at Valparaiso, a hundred miles north-west. At Santiago he kept the remainder as a reserve to be sent to the assistance of whichever of the three divisions might be attacked.