since Dutch naval superiority made it difficult to send these by sea. In December 1638, a French-backed army under Bernard of Saxe-Weimar captured Breisach in Alsace, severing the Spanish Road (see map). However, the Spanish defeated Dutch attacks on Dunkirk and Ostend in the Spanish Netherlands, and despite a French naval victory at Getaria in August, forced them to retreat from Fuenterrabía. This encouraged chief minister Olivares to reassert Spanish naval prestige by sending a large convoy to reinforce Flanders. Stripping 22 galleys from the Mediterranean, combined with a hurried construction program, meant that by August 1639 Olivares had assembled a fleet of around 50 warships along with a number of smaller vessels, manned by 6,500 sailors and 8,000 marines. In addition, 9,000 reinforcements and three million escudos for the Army of Flanders were carried in 30 transports, which included ships chartered from Germany and England, contracted under an agreement with Charles I. Dating back to the early 1630s and known as the "English Road", this took advantage of English neutrality to ship supplies and men to Dover, where they transferred to small, fast vessels for the trip across the English Channel to Dunkirk. In May, a flotilla of nine ships used this route to transport 1,500 men to Flanders, one of many similar transfers that took place over the years. Since 1621, the Spanish had avoided major conflict with the Dutch fleet in favour of raids conducted by the Dunkirk-based Armada de Flandre and privateers on their commercial shipping. In October 1637, Lope de Hoces, commander of the Armada de Coruña, transported 5,000 men from A Coruña to Dunkirk, then captured over 20 Dutch merchant ships on his return voyage. Now confident enough to seek a full-scale battle, Olivares offered him command of the expedition, but de Hoces was sceptical of his own ability to defeat the Dutch, especially given that the galleys which formed a significant part of his force were far less effective in the Channel. He refused the position, which passed instead to Antonio de Oquendo, admiral in the Mediterranean. Olivares expected the Dutch would try to prevent delivery of the reinforcements, giving Oquendo the opportunity to bring them to battle. Advised of these movements, the States General began preparing the main Dutch fleet for action. While this was being done, a squadron led by Maarten Tromp was ordered to sea to monitor and harass the