"And, whereas, the dominion of these seas has, time out of mind, undoubtedly belonged to this nation, and the ships of all other nations, in acknowledgment of that dominion, have used to take down their flags upon sight of the Admiral of England, and not to bear it in his presence, you are, as much as in you lies, to endeavour to preserve the dominion of the sea, and to cause the ships of all other nations to strike their flags and not to bear them up in your presence, and to compel such as are refractory therein by seizing their ships and sending them to be punished, according to the Laws of the Sea, unless they yield obedience and make such repair as you approve."[51]

The Commonwealth of England, in self-defence of their shipping, and as a direct blow against the Dutch, enacted the celebrated Navigation Act of 1651, directing that all goods imported into the Kingdom of Britain, or into her colonies, must be carried either in English ships or in those of the country whence the cargo was obtained.

The Dutch and English navies sailed the seas watching the movements of each other's flags, and minding the welfare of their merchant marine. Bickerings were frequent, but in May, 1652, off Dover, Tromp brought the right to salute to a crisis. The nations were then at peace, when the Dutch fleet bore down in strength upon the English without lowering their colours. As soon as Tromp was within musket-shot the English Admiral gave orders to fire at his flag. At the third shot Tromp answered by a broadside. In such way, through an episode regarding a flag, the first Dutch War began.[52] Although the Parliament had become alive to the value of a navy, yet the unpreparedness of the previous years now told its tale, for when the season of 1652 had closed, the Dutch had swept the English flag from the Narrow Seas, and Tromp is traditionally reported to have triumphantly carried a broom at his masthead as a sign of his complete success.

22. Whip-lash Pennant, British Navy.

Tromp's glory was of but short duration, for the Roundhead dragoon, Blake, nicknamed "The cavalryman at sea," soon clipped his wings. In return for the compliment of the previous year, Blake, after his victory, ran up a pennant on his mast, long and narrow like a whiplash, to show that he had in his turn driven the Dutchman off the seas; and the whiplash masthead pennants, with the St. George cross in the white ground at the head (22), borne on all His Majesty's ships in commission, serve as reminders of the story of this exploit to the present day.[53]

Peace followed in 1654. In this treaty of peace the Dutch agreed that:

"The ships of the Dutch—as well in ships of war as others—meeting any of the ships of war of the English Commonwealth in the British Seas, shall strike their flags and lower their topsail in such manner as hath ever been at any time heretofore practised under any form of government."

Thus had the old sea supremacy of the nation of England, claimed by King John, been again acknowledged; but on this occasion it was for the first time accorded to England by the terms of a formal treaty.

It was the red cross Jack of St. George, introduced by Richard I., and raised as his "Royal Flag" by King John, which had in previous times received the honour of the "Sovereign Lordship of the seas." We have seen how for a while its place had been shared by the additional two-crossed Jack of James: but now, by the incident of the temporary dissolution with Scotland under the Commonwealth, the English Jack was once more reigning in sole possession of the flag-staff, to receive by the terms of this treaty the renewal of that proud homage which its single red cross had received four centuries before. It was a happy coincidence which the flag of the seafaring Englishman most fully deserved.