Following the success of Rainsborough's expedition against Sallee, the concern of the government turned to the pirates of Algiers. The plan of attack proposed by Rainsborough1 was thought promising, but the high cost of the expedition made authorization problematic, especially after the outbreak of the First Bishops' War which strained the government's finances to breaking point. It was not until early 1640 that an expedition against Algiers came to be considered seriously again. The revival of interest was not a consequence of an improvement in the government's finances. If anything, the government's financial position had deteriorated with the growing costs of the war and the decline in receipts of Ship Money. Renewed interest for an expedition against the Barbary pirates was brought on by two unrelated developments.