In effecting this result the strict blockade maintained by the Dutch squadron at the mouth of the river, and the resolute manner in which those cruisers dashed at every vessel attempting to bring relief to Rouen, were mainly instrumental. As usual with the stern Hollanders and Zeelanders when engaged at sea with the Spaniards, it was war to the knife. Early in April twelve large vessels, well armed and manned, attempted to break the blockade. A combat ensued, at the end of which eight of the Spanish ships were captured, two were sunk, and two were set on fire in token of victory, every man on board of all being killed and thrown into the sea. Queen Elizabeth herself gave the first news of this achievement to the Dutch envoy in London. "And in truth," said he, "her Majesty expressed herself, in communicating these tidings, with such affection and extravagant joy to the glory and honour of our nation and men-of-war's-men, that it wonderfully delighted me, and did me good into my very heart to hear it from her." Instantly Farnese set himself to the work which, had he followed his own judgment, would already have been accomplished. Henry with his cavalry had established himself at Dieppe and Arques, within a distance of five or six leagues from the infantry engaged in the siege of Rouen. Alexander saw the profit to be derived from the separation between the different portions of the enemy's forces, and marched straight upon the enemy's entrenchments. He knew the disadvantage of assailing a strongly fortified camp, but believed that by a well-concerted, simultaneous assault by Villars from within and the Leaguers from without, the king's forces would be compelled to raise the siege or be cut up in their trenches. But Henry did not wait for the attack. He had changed his plan, and, for once in his life, substituted extreme caution for his constitutional temerity. Neither awaiting the assault upon his entrenchments nor seeking his enemy in the open field, he ordered the whole camp to be broken up, and on the 20th of April raised the siege. Farnese marched into Rouen, where the Leaguers were received with tumultuous joy, and this city, most important for the purposes of the League and for Philip's ulterior designs, was thus wrested from the grasp just closing upon it. Henry's main army now concentrated itself in the neighbourhood of Dieppe, but the cavalry under his immediate superintendence continued to harass the Leaguers. It was now determined to lay siege to Caudebec, on the right bank of the Seine, three leagues below Rouen; the possession of this place by the enemy being a constant. danger and difficulty to Rouen, whose supplies by the Seine were thus cut off.