These years of the first Civil War, though they would be tedious to tell in detail, are of great importance in the history of the navy. They formed the first period in which a considerable naval force was continuously maintained. Even during the reign of Queen Elizabeth the larger fleets had been armed only for particular expeditions, while during the reign of James there had been but one large armament, and, though the considerable displays of naval force had been comparatively numerous during the first fifteen years of Charles I., still they were intermittent. But the Parliament kept continually on foot what would in former times have been called a Royal Fleet. In 1642 there were 18 men-of-war and 24 hired merchant ships in commission. In 1643 this force was raised to 28 warships, 23 merchant ships, and 8 colliers for service on the coast of England, besides 8 men-of-war and 13 hired merchant ships for service on the coast of Ireland. This makes a total of 80 vessels; and when we consider the average tonnage and weight of broadside, it represents a much greater force than was ever under the command of the officers of the great queen. The mere habit of continual cruising together in fleets must have had an instructive effect, of which the English Navy was to reap the benefit in the approaching struggle with Holland. Regular men-of-war crews must have been gradually formed, and the Parliament secured the services of a trained body of officers.

Before the value of this practice was to be put to the test, the nation, and the navy with it, were destined to pass through the sharpest convulsion in the whole course of our history. The first Civil War came to an end, having practically settled nothing except that the Parliament had proved itself strong enough to beat down the king's partisans. King Charles did not, however, consider himself completely defeated. Indeed he was incapable of understanding that utter overthrow was possible for the king who held his place by Divine Right. Wicked rebels might prove too strong for him for a time, but it was his firm conviction that in the long-run no party could do without him. Thus, even before he was delivered by the Scots into the hands of his Parliament, he began the desperate game of playing off one party of his conquerors against the other. The Presbyterians remained of the opinion, as when they had begun the war, that they could beat the king utterly, and yet leave him not only king, but prepared to co-operate with them. One of the purposes for which they expected his aid was the suppression of the Independents, who were fully as offensive to the Presbyterians as the Presbyterians were to the Church of England. But the Independents were the commanding element in the New Model Army, which represented the whole armed force of the Parliament, since its other troops had been disbanded on the conclusion of the war. The Independents were thoroughly resolved that, after fighting to be free from the Church of England, they would not submit to dictation by the Presbyterians. The king began trying to set them by the ears; and out of these rivalries and intrigues, with the help of a Presbyterian army from Scotland, there arose the second Civil War.

In this struggle the navy was more visibly affected by the divisions of the nation. Its leaders had begun to discover that it was not so simple a business as they had thought, to beat the king and yet leave him uninjured. Moreover, professional rivalry affected them to no small extent. The sea officers were offended when they saw the whole effective power of the nation in the hands of the New Model Army. Their loyalty to the king was vigorously revived when they found that not only the Crown, but they themselves, were at the orders of a committee of successful soldiers. So, during 1647 and 1648, the navy was agitated by dissensions. In the spring of 1648 the party which was now, by the help of the soldiers, supreme in Parliament began to be very uneasy about the spirit of the fleet. There was a great deal of dangerous talk as to the necessity for a personal treaty with the king; while ship's companies took to imitating the "agitators" who had organised the pronunciamiento of the soldiers at Triploe Heath and elsewhere. They also had their ideas as to the settlement of the nation. In view of this untrustworthiness of their naval force, Parliament decided to put the command of the fleet into other hands. Batten was removed from his place as second in command to Warwick, and Penn, who had served throughout the war on the coast of Ireland, and had finally been in actual command of the station, was put under arrest. A military officer, Colonel Rainsborough, was sent to take command of the squadron in the Downs and the river. This measure provoked a partial revolt in May 1648. The officers and men of the ships which were to have been under the command of Rainsborough refused to obey his orders, and put him on shore. This action was justified by a declaration of principles on the part of "the commanders and officers of the ship Constant Reformation with the rest of the fleet." These politicians stated their view of the best way for providing a settlement for the nation. They were in agreement with the Kentish petitioners, and their demands were grouped under four heads.

"First,—That the King's Majesty, with all expedition, be admitted in safety and honour to treat with both Houses of Parliament.

"Secondly,—That the army now under the command of the Lord Fairfax be forthwith disbanded, their arrears being paid them.

"Thirdly,—That the known laws of the kingdom may be established and continued, whereby we ought to be governed and judged.

"Fourthly,—That the privileges of Parliament and liberty of the subject be preserved."

In the following month this declaration was amended by the complaints that the Parliament had taken to issuing commissions without the name of the king; that several landsmen had been made sea-commanders, and that "the insufferable pride, ignorance, and insolency of Colonel Rainsborough, the late Vice-Admiral, alienated the hearts of the seamen." The political side of these pronouncements need not detain us long. If these were the aims of the seamen, they were trying, as the Presbyterian party in Parliament also were, to bring things back to the point at which they had been before 1638, with this difference, that the king was to show himself converted to their way of thinking by ten years of failure, defeat, and bitter indignity. Like the Presbyterians, they forgot to secure the co-operation of the king. The complaint that Parliament had taken to issuing commissions without the royal name shows that the sailors, or at least those who spoke for them, were immensely surprised at the result of their own efforts. When they made it a grievance that several landsmen had been made sea-commanders, they were inventing an entirely new grievance. Landsmen always had been sea-commanders, and were to be so again in the coming years.

It is hard to say how far the discontent of the seamen had anything to do with the revolt, if that can be called a revolt which was, in fact, a refusal to obey revolutionary authority. It was probably mainly the work of a few officers, and the men were carried away by the example of their commanders and by the contagious example of the Royalists in the county of Kent. The officers did in some cases belong to the Presbyterian Parliamentary party, which was now becoming Royalist under the stimulus of rivalry with the Independents.