At sunset the wind freshened, and at daybreak on Saturday the English were seen following up closely, but there was no fighting, "the Armada sailing with a fair wind and the rear close up, and in very good order." At 10 a.m. the French coast near Boulogne was in sight. At four in the afternoon the Armada was off Calais, and at five orders were given to anchor in Calais roads, "seven leagues from Dunkirk," or between Calais and Gravelines. The Spaniards noticed that some thirty-six ships had joined Howard's fleet, which anchored about a league away. The new arrivals were Seymour's and Winter's squadrons from Dover and the Downs.

Medina-Sidonia now believed that he had all but accomplished his task. English writers say that the enemy were disappointed and discouraged when they anchored off Calais, but there is no proof of this in contemporary Spanish accounts. Medina-Sidonia thought it a success that he had got into touch with the Viceroy of the Netherlands. He had sent off a messenger to his head-quarters at Dunkirk, asking him to embark his army at once, and declaring his readiness to convoy it across Channel.

But Medina-Sidonia was in a fool's paradise. His ignorance of war was the ultimate source of his satisfaction with the outlook. Better men, like Leyva and Recalde, realized that until the enemy's fleet was not merely eluded, but effectively beaten, there could be no invasion of England. The French Governor of Calais told the admiral that a change in the weather might make his position very unpleasant, and Medina-Sidonia urged Parma to act at once by telling him "that he could not tarry without endangering the whole fleet."

But Parma was neither ready nor anxious for any prompt action. The fleet of the Netherlanders, some fifty sail, was blockading most of the places along the coast where he had prepared his flat-bottomed boats. He knew better than to embark the force he had in hand at Dunkirk till Howard's fleet was disposed of.

But Howard was determined not to leave the Armada undisturbed in its exposed anchorage. He had no sooner been joined by Seymour and Winter than he hurriedly prepared eight small craft in his own fleet to be used as fireships, by turning over to them all the inflammable lumber he could collect from the other vessels, and removing their guns, ammunition, and stores.

Medina-Sidonia had spent the Sunday writing pressing letters to the Prince of Parma, and obtaining fresh water and other supplies from Calais. When the long summer twilight ended the Armada was still riding at anchor, the irregular lines of dark hulls stretching for miles, with lanterns flickering at yard-arm or poop, and guard-boats rowing about the outskirts of the floating city. At midnight there was a cry of alarm passed from ship to ship. The tide was running strong from the westward through the Straits, and sweeping along on its current came eight dark masses, each defined in the night by a red flicker of fire that rose higher and spread wider as the English fireships came nearer and nearer.

Three years before, when Parma was besieging Antwerp, the revolted Netherlanders had attacked the bridge he had thrown across the river below the city by sending drifting down upon it a ship laden with powder barrels, with a burning fuse and powder-train to fire them, and blocks of stone heaped over them to increase the force of the explosion. The awful destruction caused by this floating volcano made the Spaniards long after fearful of the attempt being repeated elsewhere, and Medina-Sidonia tells in his diary that when Howard's fireships came drifting through the summer night off Gravelines, he and his captains thought that they were likely to be maquinas de minas, "contrivances of mines," like the terrible floating mine of Antwerp. With this suspicion, all idea of grappling them was abandoned. As they drew nearer there was something like a panic in the Armada. The admiral signalled to weigh anchor and make sail, but few of the ships waited for the tedious operation of getting the heavy anchors up to the cat-heads by slow hand labour on windlass or capstan. In most of the galleons the carpenter's broad axe hacked through the cables and left the anchors deep in Channel mud. Sails were hurriedly shaken out, and like a startled flock of sheep the crowd of ships hurried away to the eastward along the coast in wild disorder. Moncada, the admiral of the galleasses, in the "San Lorenzo," collided with the galleon "San Juan de Sicilia," and the great galleass dismasted and with shattered oars drifted on a back eddy of the tide towards Calais bar. The fireships went aground here and there, and burned harmlessly to the water's edge. Medina-Sidonia, seeing the danger was over, fired a gun as a signal for the fleet to anchor, but most of the ships had cut their cables, and had no spare anchors available on deck, and they drifted along the coast, some of them as far as Dunkirk. The sunrise on the Monday morning showed the great fleet widely scattered, only a few of the best ships being with the admiral. Moncada's flagship had been left by the falling tide hard aground on Calais bar.

The English attacked the stranded galleass in pinnaces and boats, Howard with some of the larger ships standing by "to give the men comfort and countenance." Some of the Spaniards escaped to the shore. The rest, headed by Moncada, made a brave stand against the boarders, who swarmed up her sides, led by one Richard Tomson, of Ramsgate. Moncada was killed, and the ship taken. The English pillaged her, but the hulk was abandoned and seized later by the French Governor of Calais.

During this fight on the bar Medina-Sidonia had reassembled about half his fleet, which he formed in a great crescent off Gravelines. The wind was from the west, and numbers of galleons were away to leeward. Some of them were in dire peril of driving ashore. Howard saw his advantage, and the whole English fleet bore down on the Spanish crescent. It was the nearest thing to a pitched battle in the whole Armada campaign. The English came on with wind and tide helping them and, with the confidence that was the outcome of their growing sense of superiority, ventured to close quarters with the tall Spaniards, while taking care never to give them the chance of grappling and boarding. As the fight went on the Spaniards worked slowly towards the north-east edging off the land, for their deep draught and the fate of Moncada's galleass made them anxious about the Flanders shoals.

Howard and Hawkins led the English centre, Drake and Frobisher the right, Seymour and Winter the left. Not a shot was fired till they were at musket range, and then the English guns roared out in a well-sustained cannonade in which every shot told. It was the first of modern naval battles, the fights decided by gunfire, not by hand-to-hand conflict on the decks. The Spaniards answered back with their lighter and more slowly served artillery, and with a crackle of musketry fire. Before noon the Spanish cannon were mostly silent, for sheer lack of ammunition, and the galleons defended themselves only with musket and arquebuse, while striving in vain to close and grapple with their enemies. Spars and rigging were badly cut up, shots between wind and water were letting the sea into the huge hulls. Just as the English thought the "San Juan de Sicilia" had been put out of action and would be their prize, the galleon heeled over and went to the bottom. Soon the fight was only sustained by the rearward ships, the rest trying to extricate themselves from the mêlée, not for any lack of courage, but because all their ammunition was gone, their decks were encumbered with wreckage from aloft, and the men were toiling at the pumps to keep them afloat.