When the Armada was ready, it set sail from Lisbon in late May, 1558. The ships traveled together, which meant the entire group could only move as fast as its slowest member.
Medina-Sedonia, the admiral in charge, sailed in the San Martín. It was a galleon - a very large ship powered only by sail. Most of the Spanish ships were galleons.
A galleass has both sails and oars. The Armada also had some of those. With less firing power (since oars take the place of some cannon), galleasses also have an advantage: They can move even when there is no wind.
Contemporary sources describe the Armada:
The saide [said] Spanish fleete, being the best appointed of men, munition, and all manner of provision of all that ever the Ocean saw, and called by the arrogant name of Invincible [likely an English description], consisted of 130 shippes. In which were:
Soldiours - 19299
Saylors - 8350
Galley-slaves - 2080
Great ordinance - 1630(William Camden, Annales Rerum Angliae et Hiberniae Regnante Elizabetha,
1588, Section 15)
As the Armada slowly made its way toward the English Channel, the fleet encountered unseasonably bad weather. Medina-Sedonia, who had never before been at sea and had never commanded soldiers in battle, was worried.
The King had ordered him to sail to - and across - the English Channel, without stopping, until he reached Spanish-controlled Holland. There he would meet the Duke of Parma whose troops and ships would provide Spain with a large-enough force to invade England.
But ... most of Medina-Sedonia’s ships only moved with the wind. When it came from the wrong direction - or not at all - what was the Admiral of the Fleet to do? How could he follow Philip’s directions - and not stop the Armada - when supplies (including food and water) were running out?
When storms battered and separated his ships, the Duke believed - as he had from the beginning - that the whole expedition was fruitless. On the 24th of June, he wrote to the King, advising His Majesty of their predicament and courageously asking a critical question:
Well, Sire, how do you think we can attack so great a country as England with such a force as ours is now? (Quoted in With the Heart of a King, by Benton Rain Patterson, page 275.)
Trying to convince Philip (now sixty-one years old) that the bad weather was providential, the Duke continued:
Since this is a cause of our Lord to whose care it has been - and is being - so much entrusted, it would appear that what has just happened must be His doing, for some reason. (Quoted by Patterson, page 275.)
The King, however, was unpersuaded and had an equally forceful response:
If this were an unjust war, one could indeed take this storm as a sign from our Lord to cease offending Him, but being as just as it is, one cannot believe that He will disband it, but will rather grant it more favor than we could hope. (Quoted by Patterson, page 276.)
By dawn the next day, Medina-Sedonia could see the signal fires ablaze on Britain’s shore. Faster than a horseman riding to the Queen, the fires (which could transmit a signal from Plymouth to Carlisle in about forty minutes) would alert everyone along the entire coast that a mighty Armada had arrived.