It will be noticed that all these edicts regarding neutral waters in which the limit of cannon range was prescribed, emanated from the small Mediterranean states; but in many of the international treaties which followed the Armed Neutrality of 1780 the gunshot limit for neutral waters was also adopted. This league, which was directed against Great Britain, had its source in a declaration by the Empress Catherine II. of Russia regarding the rights of neutrals; especially that neutral vessels should be free to carry on trade on the coasts of belligerents, and that the property of belligerents in neutral vessels, except arms, equipment, and munitions of war, should be free from capture. The seizure of enemy’s goods in neutral ships by English cruisers bore hardly on the commerce of neutral countries; and for this reason, and, according to English views, because it was perceived by the other Powers that they could not directly contend against the naval force of Great Britain, a new code of international law was introduced which would have the effect of sapping it.[1051] In some of the treaties referred to, the limits of neutral waters were defined in vague or general terms, as in that of 1782 between the United States and the United Provinces.[1052] The gunshot limit, however, was specified in a treaty between the United States and Morocco in 1785, which stipulated that if a vessel of either state was engaged with that of another Christian Power within the range of guns of a castle of the other state, it was to be protected and defended;[1053] in a treaty of navigation and commerce between Great Britain and France in 1786;[1054] and in a treaty between France and Russia in 1787. In the latter it was stipulated that in agreement with the principles laid down in the Russian declaration regarding the navigation of neutrals, either Power, if at war, should abstain from attacking the enemy’s vessels within cannon range of the coasts of the other Power, or in the ports, harbours, gulfs, and “other waters comprised under the name of closed waters.”[1055] Russian activity in the direction indicated was shown by the conclusion of a similar treaty in the same terms with the Two Sicilies a few days later.[1056] A little later, in 1803, the range of guns was adopted by Austria as determining the extent of neutral waters, as in the treaties above referred to.[1057]
In contrast to the gunshot limit in connection with neutrality, was another which Spain incorporated in a treaty with Tripoli in 1784, by which it was agreed that Tripolitan vessels of war or privateers should not capture ships of their enemy within ten leagues of the coasts of the Spanish dominions[1058]—that is to say, within the same extent of sea as was expressed in the treaty between France and Algeria a century earlier.[1059] A few years later the same limit of ten leagues was agreed to in a treaty between Great Britain and Spain concerning fisheries and navigation in certain parts of the Pacific. Disputes had arisen with Spain concerning proceedings at Nootka Sound, Vancouver; and in a convention between the two Powers, signed in 1790, it was agreed, inter alia, that British subjects should not navigate or carry on their fishery within a distance of ten sea leagues from any part of the coast already occupied by Spain, the object being to prevent illegal trading with the Spanish settlements.[1060]
We thus perceive that towards the end of the eighteenth century various maritime boundaries were assigned in particular places for particular purposes, and that many states looked upon the limit of gunshot from an open coast as fixing the extent of their neutral waters. But hitherto, with the exception of the league limit prescribed by Denmark and Norway, which had no avowed reference to the range of guns, and was in reality equivalent to much more than three miles, no Power had yet adopted one marine league as the equivalent of gunshot from the shore. It appears that this step was first taken by the United States of America, and it is of interest to note that the three-mile limit was put forward tentatively, and, in a manner, as a temporary expedient. When the war between Great Britain and France broke out in 1793, the United States found it necessary to define the extent of the line of territorial protection which they claimed on their coast, in order to give effect to their neutral rights and duties. Washington, who was then President, instructed the executive officers to consider the line restrained, for the time being, to the distance of one sea league, or three geographical miles, from the shores, a distance which was said to be not more extensive than was claimed by any other Power. This limit was adopted tentatively, since the Government “did not propose, at that time, and without amicable communication with the foreign Powers interested in the navigation of the coast, to fix on the distance to which they might ultimately insist on the right of protection.” It was stated that the greatest distance to which any “respectable assent” among nations had ever been given was the range of vision, which was estimated at upwards of twenty miles, and the smallest distance claimed by any nation was “the utmost range of a cannon-ball, usually stated at one sea league.”[1061] Besides the extent of sea referred to, the bays and rivers were held by usage and the law of nations to be territorial, with immunity from belligerent operations. This was well shown in the same year, when the United States claimed that the whole of Delaware Bay and New Jersey, an arm of the sea about fifty English miles in length and a little over eleven miles wide at the entrance, was under their territorial jurisdiction, and ordered the restitution of a British vessel, the Grange, which had been captured there by a French frigate, L’Ambuscade; and this was done notwithstanding the protest of the French Minister that Delaware Bay was open sea and not under the exclusive jurisdiction of the United States. The American Government rested its action on the law of nations, and declared that they were entitled to attach to their coasts an extent of sea beyond the reach of cannon-shot—a claim which showed that the three-mile limit had not been adopted as an inflexible rule.[1062]
Next year the United States Congress passed a law authorising the district courts to take cognisance of all captures made within one marine league of the American shores;[1063] but in the treaty concluded between Great Britain and the United States in the same year, it is interesting to observe that the less precise limit of gunshot was adopted, in the same words as in the treaty of 1786 between Great Britain and France. The twenty-fifth article of this treaty provided that neither Government should permit the ships or goods belonging to the citizens or subjects of the other “to be taken within cannon-shot of the coast, nor in any of the bays, ports, or rivers of their territories, by ships of war, or others, having commissions from any prince, republic, or state whatever.”[1064]
It may be mentioned here that the claims which have been put forward by the United States as to the extent of their territorial or jurisdictional waters have varied greatly on different occasions. The above declaration to M. Genet was, for instance, repudiated by President Jefferson as establishing a fixed limit; and it was claimed that the limit of neutrality should extend “to the Gulf Stream, which was a natural boundary (!), and within which we ought not to suffer any hostility to be committed.”[1065] On another occasion, in a controversy about the right of jurisdiction, they claimed that the extent of neutral immunity off the American coast ought at least to correspond with the claims maintained by Great Britain around her own territory, and that no belligerent rights should be exercised within “the chambers formed by headlands, or anywhere at sea within the distance of four leagues, or from a right line from one headland to another.”[1066] The American Government endeavoured to obtain from England in the same year the recognition of a territorial belt six miles in breadth, and in the draft treaty proposed in 1807 a distance of five miles was in reality specified.[1067]
CHAPTER II.
GENERAL ADOPTION OF THE THREE-MILE LIMIT.
It is evident from the foregoing that, notwithstanding the variation in the extent of water claimed in certain cases, the principle of determining the general boundary of the territorial sea by the range of guns from the coast had become tolerably firmly established in the practice of nations before the end of the eighteenth century, with reference in particular to the rights of neutrals. Shortly before the century closed, moreover, we have seen that one of the important maritime Powers, the United States of America, had adopted a fixed distance of three miles or one marine league as equivalent to the utmost range of the cannon of those days. The range of guns naturally varied according to their size and power, and though it was specified in some of the Continental ordinances that the distance was to be determined by a large gun of battery, there was no certainty that it would be everywhere the same. It was thus clearly an advantage to have a fixed distance, which could be marked on charts, substituted for the less definite cannon range, so long as it really represented it. By the progress of the military art, however, most notably perhaps after about the middle of last century, the range of guns became enormously increased, so that long ago the three-mile limit ceased to represent it.
The new boundary of one marine league, as equivalent to the range of guns, was soon introduced into English law and practice, in the first place through the decisions of the High Court of Admiralty in questions affecting the extent of neutral waters. It is noteworthy that nothing was heard at this period about the principle of the King’s Chambers in such cases. It is very doubtful whether, as the American Government implied in 1806, the boundaries of the King’s Chambers had retained their validity at the beginning of last century. There seems to be no evidence that they were enforced during the eighteenth century, or even in the closing years of the seventeenth, possibly because occasions to test the point had become rare. But it is perhaps more probable that the claim to the King’s Chambers was allowed gradually to die out, and that the deliberate omission of any reference to them in the later proclamations of Charles II. ([see p. 554]) foreshadowed this change in practice. It is clear at all events that long before the end of the eighteenth century it was well established that a vessel captured by one belligerent from another belligerent in a port of a neutral state or within the actual reach of cannon was not good prize.[1068] The next step was to give effect to the same principle, whether the place was actually within the range of a fort or not.
The decisions which introduced the three-mile limit into English jurisprudence were those of Sir William Scott (afterwards Lord Stowell) at the beginning of last century. In 1800 and 1801 this great authority adopted both the gunshot limit and the distance of three miles as its equivalent for the boundary of neutral waters, in deciding the well-known cases of the Twee Gebroeders. It was these decisions of Lord Stowell’s which introduced the three-mile limit into English jurisprudence. The cases arose from the capture of certain vessels in 1799, by the boats of a British man-of-war, in the Groningen-Watt, between East Friesland and the island of Borkum, in the belief that they were bound from Hamburg to Amsterdam, which was then blockaded by the British; and it was claimed by the King of Prussia that the capture was made within the territory of that state. In deciding the first case,[1069] Lord Stowell found that the capturing vessel was “lying within the limits to which neutral immunity is usually conceded. She was lying in the eastern branch of the Eems, within what may, I think, be considered as a distance of three miles, at most, from East Friesland. An exact measurement cannot easily be obtained; but in a case of this nature, in which the Court would not willingly act with an unfavourable minuteness towards a neutral state, it will be disposed to calculate the distance very liberally; and more especially, as the spot in question is a sand covered with water only on the flow of the tide, but immediately connected with the land of East Friesland, and when dry, may be considered as making part of it. I am of opinion, that the ship was lying within those limits in which all direct hostile operations are by the law of nations forbidden to be exercised.”[1070] In this decision the three-mile limit is assumed to be, “by the law of nations,” the boundary of the neutral waters. It is also to be observed that the distance was reckoned, not from low-water mark, but apparently from the land; while according to the rule apparently governing such cases now, the sand-bank itself would be a part of the territory, and the distance of three miles would be measured from its outer margin at low water ([see fig. 19], p. 635).