The 1620s were good years for Spanish foreign policy: the war with the Dutch went well, albeit at great expense, culminating in the retaking of the key city of Breda in 1624. By the end of the decade, however, Philip's government was faced with the question of whether to prioritise the war in Flanders or Spain's relationship with France during the War of the Mantuan Succession (1628–1631). Philip's advisors recommended prioritising the war in Flanders, taking action to safeguard the Spanish Road to the Netherlands but at the cost of antagonising Louis XIII. Strategically this was to prove a disaster. Despite fresh Spanish successes in the mid-1630s – in particular, the triumph of Philip's government in raising a fresh Spanish army, marching it into Germany to defeat the Swedish-led Protestant forces at the Battle of Nördlingen in 1634 – the increased tensions with France made war between the two Catholic states increasingly inevitable. Olivares advised Philip that the coming war with France would be all or nothing; Spain would win or fall by the result.