It will be recalled that in February, 1915, the Imperial German Government announced its intention to treat the waters surrounding Great Britain and Ireland as embraced within the seat of war and to destroy all merchant ships owned by its enemies that might be found within any part of that portion of the high seas, and that it warned all vessels, of neutral as well as of belligerent ownership, to keep out of the waters it had thus proscribed or else enter them at their peril. The Government of the United States earnestly protested. It took the position that such a policy could not be pursued without the practical certainty of gross and palpable violations of the law of nations, particularly if submarine craft were to be employed as its instruments, inasmuch as the rules prescribed by that law, rules founded upon principles of humanity and established for the protection of the lives of non-combatants at sea, could not in the nature of the case be observed by such vessels. It based its protest on the ground that persons of neutral nationality and vessels of neutral ownership would be exposed to extreme and intolerable risks, and that no right to close any part of the high seas against their use or to expose them to such risks could lawfully be asserted by any belligerent government. The law of nations in these matters, upon which the Government of the United States based its protest, is not of recent origin or founded upon merely arbitrary principles set up by convention. It is based, on the contrary, upon manifest and imperative principles of humanity and has long been established with the approval and by the express assent of all civilized nations. Notwithstanding the earnest protest of our Government, the Imperial German Government at once proceeded to carry out the policy it had announced. It expressed the hope that the dangers involved, at any rate the dangers to neutral vessels, would be reduced to a minimum by the instructions which it had issued to its submarine commanders, and assured the Government of the United States that it would take every possible precaution both to respect the rights of neutrals and to safeguard the lives of non-combatants.