Attempts by the French admiral
Henri de Sourdis to disrupt Spanish preparations failed and the fleet sailed on 27 August, entering the Channel on 11 September. Ships of different squadrons were mixed through the formation, an attempt to ensure smaller ships would be supported by larger ones. The
vanguard was composed of thirteen ships from the
Armada de Flandes under
Miguel de Horna, since they had the most experience in these waters; De Horna himself accompanied Oquendo on board his flagship. On 15 September, they learned from a passing English ship that a Dutch squadron was anchored near
Calais and the next day made contact with Tromp. Following his instructions, Oquendo adopted a half-moon formation, placing his flagship on the right flank; despite being outnumbered, Tromp placed his squadron into
line of battle and attacked. During the
Fight in the Channel Oquendo used the same tactics employed in his 1631 victory at
Abrolhos, where he had destroyed the Dutch flagship in a single ship to ship battle. He failed to issue adequate instructions to his subordinates and negated his superior numbers by constantly seeking to engage Tromp's flagship. This manoeuver, however, was effected without warning the rest of the Spanish fleet. Some of the ships near Oquendo turned with him, others were confused and maintained bearing. The half-moon formation quickly disintegrated, and only the Dunkirk squadron and the galleon
San Juan kept up with the Spanish flagship's pursuit of Tromp. Had Oquendo given the order for a line, the immense Spanish fleet could have probably encircled and dispatched the Dutch squadron in a few hours. However, Oquendo seemed intent on boarding the Dutch flagship. When he finally decided to turn for a shot, he did it too late and sailed past Tromp's stern. Trying to correct his error, Oquendo attempted to board the second ship in the Dutch column. The latter also avoided him. Oquendo's flagship and one of the Dunkirk ships, the
Santiago, were now downwind and on the receiving end of the cannonades of the remaining nine ships of the Dutch column. Tromp turned his column and went for another round on the
Santiago. Oquendo, the other six Dunkirk ships and the
San Juan, unable to turn upwind, fired as they could. The artillery did little damage, but Spanish musketry picked off many on the Dutch decks. This encounter lasted for three hours, in the course of which the Dutch ship
Groot Christoffel accidentally exploded. By noon, the six ships of the
Witte de With column had reached Tromp, and increased his number to 16. Although the rest of the Spanish fleet remained dispersed and disorganized, many units had finally turned and were also approaching from the other side. For Tromp, this was building up into a dangerous situation, as the Spanish units upwind would cut off his exit, and force the Dutch squadron to turn into the shoals of the bay of
Boulogne and almost certainly run aground. However, at this moment, Oquendo ordered the Spanish fleet to resume a half-moon formation. The Spanish ships turned, allowing Tromp's squadron to turn also, gain the wind, and escape the danger. There were no more engagements that evening. The fleets anchored in, and the next day, rear-admiral
Joost Banckert arrived, bringing the total Dutch fleet to thirty-two. But there was no engagement, just preparations for what was to become known as the Battle of the Downs. ,
circa 1639, depicting the Dutch blockade off the English coast, the vessel shown is the
Aemilia, Tromp's flagship. The Spanish, whose priority was to protect the troops, not to endanger them by continuing the battle, took refuge in
The Downs, an anchorage between the English ports of Dover and
Deal, near an English squadron commanded by Vice-Admiral
John Pennington. Ocquendo ordered 13 of his Dunkirker squadron, composed of light, fast
frigates, to head north at night round the
Goodwin Sands; although the Dutch later sealed this exit, they arrived in Dunkirk with 3,000 troops and all the bullion intended to pay the Army of Flanders. Ultimately, the Spanish calculated 6,000 troops had been landed, with 1,500 captured by the Dutch and another 1,500 either killed or interned in England, which allowed Ocquendo to later claim he had largely achieved the objectives set. On the evening of 28 September, Tromp and De With withdrew to resupply, for they were short of gunpowder. They feared they had failed in their mission until they rediscovered the Spanish at the Downs on the 30th. Together, they blockaded the Spanish and sent urgently to the Netherlands for reinforcements. The five
Dutch admiralties hired any large armed merchant ship they could find. Many joined voluntarily, hoping for a rich bounty. By the end of October, Tromp had 95 ships and 12
fire ships. Meanwhile, the Spanish, who earlier had managed to sneak 13 or 14 Dunkirker frigates through the blockade, began to transport their troops and money to Flanders on British ships under an English flag. Tromp stopped this by searching the English vessels and detaining any Spanish troops he found. Uneasy about the possible English reaction to this, he pretended to Pennington to be worried by his secret orders from the
States-General. He showed him, "confidentially", a missive commanding him to attack the Spanish armada wherever it might be located and to prevent by force of arms any interference by a third power. Meanwhile, Tromp's patience was tested to the limit. His war council would not yet agree to an attack while the Spaniards claimed they did not have enough gunpowder to sail out. This prompted a remarkable offer from the Dutch. On 13 October, two captains on behalf of Tromp reported to Pennington that they were willing to supply the Spanish fleet with 500 barrels of gunpowder on the condition that the fleet would then immediately sail out to battle. Oquendo did not accept the offer, but conflict almost broke out anyway on the 14th when a Spanish marksman shot dead a sailor on a Dutch ship. According to Oquendo, the gunman was an incredibly stupid peasant who would be severely punished. Still, in the following days, Oquendo and Tromp both began to prepare for battle, while Pennington was given permission to withdraw in case of a battle. ==The battle==