The blockade caused an economic crisis for the Republic and it reacted by trying to harm the enemy in its colonies. In 1628 one of the many schemes undertaken met with spectacular success when Admiral Piet Hein of the Dutch West India Company captured the Spanish treasure fleet. The vastly improved financial situation of the Republic allowed for a major counter-stroke and Stadtholder Frederick Henry decided to break the Habsburg morale by conquering their main stronghold in the Netherlands. This came very unexpectedly; most had predicted the goal of his campaign would be Breda, which had been retaken by the Habsburgs in 1625.