In consequence of this aggression, the Powers made a treaty, called the Quadruple Alliance, by which the Emperor was to give up his claim to the crown of Spain, to receive Sicily from the Duke of Savoy, and to give him Sardinia in its place, with the title of King. Philip would not agree to this arrangement and continued his preparations for war, without any regard to the remonstrances of England and even of France. In this he was strongly influenced by his second wife and by his Minister, Cardinal Alberoni.

In order to prevent farther mischief in the Mediterranean a formidable fleet was got ready at Spithead, under the command of Admiral Sir George Byng, with orders to hinder and resist all attempts of Spain against Italy or Sicily. Byng sailed on June 25, 1718, with twenty ships of the line, two fire-ships, two bomb-ships, a hospital-ship, and a store-ship. Off Cape St. Vincent he sent a messenger, by way of Cadiz, to convey a letter to Lord Harrington, the British Envoy at Madrid, that the Spanish Government might be informed of the approach of the British fleet and of Byng’s instructions.

The Envoy showed the letter to Cardinal Alberoni, who declared that his master would run all hazards rather than recall his fleet and troops, that the Spaniards would not be frightened, and that he had no fear of the result if Admiral Byng attacked them. The Envoy then requested his Eminence to look over a list of the British ships which he held in his hand. Alberoni snatched it and threw it on the ground, trampling on it in a great passion.

There was nothing more to be done with such a violent diplomatist. The British fleet entered the Mediterranean, and arrived at Port Mahon on July 23. Here the Admiral landed four regiments, and took the marines forming the old garrison to serve in the fleet. On August 1 the Admiral arrived at Naples, and conferred with Count Daun, the very popular Viceroy for the Emperor Charles VI. It was found that the Spaniards had landed an army in Sicily and were besieging Messina, and that there was a large Spanish fleet there, consisting of twenty-nine ships of the line and frigates, two being seventy-four-gun ships and eight with sixty guns.

On August 9 Sir George Byng with his formidable fleet arrived off Messina, and sent a letter to the Spanish General proposing to him that he should grant a cessation of hostilities for two months, to give time for the Powers to agree to a lasting peace, apprising him of his instructions in case of refusal. The Spaniard replied that he had no powers to treat, and that he would obey his orders, which were to seize Sicily for the King of Spain.

The Spanish fleet had weighed the day before, and was out of sight to the south. Byng went in chase, and before noon of the next day he came in sight of their twenty-seven men-of-war in order of battle. Don Antonio de Castaneta was the Admiral in command, and there were four rear-admirals, one of them an Irish renegade named Cammock. On sighting the English fleet they stood away, but still in order of battle. All that day and the succeeding night the English Admiral followed them. Early in the morning of the 11th one of the Spanish rear-admirals parted company with six frigates and all the galleys, bomb-vessels, and store-ships, standing for the Sicilian coast near Syracuse. Captain Walton of the Canterbury, with five vessels under his command, was detached in pursuit. Walton’s report of his proceedings is a model of business-like brevity:

‘Sir,—We have taken and destroyed all the Spanish ships and vessels which were upon the coast, the number as per margin.’

Admiral Byng continued the pursuit of the main fleet and came up with it off Cape Passaro. The Orford and Grafton were the foremost ships, and the Spaniards fired their stern chase guns. The order was given not to return the fire unless it was repeated. It was repeated, and the Orford promptly engaged the Santa Rosa, of sixty-four guns, and took her. Next the San Carlos, of sixty guns, struck to the Kent. The Principe de Asturias, with the flag of Rear-Admiral Chacon, was dealt with by the Breda and Captain. The Spanish Admiral’s flagship, of seventy-four guns, made a running fight until 3 P.M., and then struck to the Superbe. Three other ships were taken. Sir George Byng employed the next few days refitting and repairing damages in the prizes. Nine of the Spanish ships escaped, thirteen were taken and became prizes, three were burnt, three sunk. Practically the Spanish fleet ceased to exist.

The value of Minorca as a base then became apparent. Rear-Admiral Cornwall was sent to Port Mahon with the ships that required repairs and all the prizes. On February 3, 1719, Sir George Byng went with the rest of the fleet to Port Mahon, to refresh the men and refit the ships. Returning to Naples in April, he found that Count Mercy had been appointed to the command of a German army to expel the Spaniards from Sicily. Mercy was a tall, soldier-like man, but excessively short-sighted. He had great strength of mind and body, was very ambitious, with an insatiable thirst for glory. He would have been a greater general if he had been endowed with a cooler temper. The task before him was a difficult one, although the English fleet gave him command of the sea. All things being ready, Sir George Byng sailed from Baia with eight men-of-war, escorting two hundred transports having on board 10,000 infantry and 3,500 horse. By the advice of the Savoyard Governor of Melazzo, the landing was effected on the coast about twenty miles to the westward of that fortress. Count Seckendorf was detached to reduce the Lipari Islands to the Emperor’s obedience—an important matter, so as to keep the communications open between Naples and Sicily.

The Sicilian campaign commenced in May 1719, and there was some very severe fighting. Count Mercy found himself in considerable difficulties in the interior; for the natives were on the side of the Spaniards. He sent a message with an urgent request that Sir George Byng would come to him for a consultation. The Admiral did not hesitate. He set out with a strong escort, accompanied by his eldest son and Captain Matthews of the Kent. The road was strewn with the dead bodies of men and horses, and was very rugged, but they reached the Count’s tent in the evening. A guard of honour was drawn up for the Admiral’s reception, and one of the men was shot through the head at the door of the tent by a musket-ball from the enemy’s camp. He fell dead at the Admiral’s feet as he dismounted. Sir George found the Count very weak from a wound, the ball not having yet been extracted. But he was full of pluck, and desirous of again attacking the Spaniards in their strong position, though his officers advised a retreat to the coast. A council next day confirmed this opinion, and dwelt on the urgency of receiving reinforcements. Sir George therefore returned to the coast and immediately proceeded with two ships to Naples to represent the state of things to the Viceroy. He then returned to Sicily, where he found that Count Mercy had been disabled by an apoplectic seizure; but that his second in command had taken Taormina by surprise and advanced to Messina, where the siege was commenced on July 20. The town surrendered and Sir George Byng took his fleet into the harbour, but the citadel held out.