"The Government of the United States has been apprised that the Imperial German Government considered themselves to be obliged, by the extraordinary circumstances of the present war and the measures adopted by their adversaries in seeking to cut Germany off from all commerce, to adopt methods of retaliation which go much beyond the ordinary methods of warfare at sea, in the proclamation of a war zone from which they have warned neutral ships to keep away. This Government has already taken occasion to inform the Imperial German Government that it cannot admit the adoption of such measures or such a warning of danger to operate as in any degree an abbreviation of the rights of American shipmasters or of American citizens bound on lawful errands as passengers on merchant ships of belligerent neutrality; and that it must hold the Imperial German Government to a strict accountability for any infringement of those rights, intentional or incidental. It does not understand the Imperial German Government to question those rights. It assumes, on the contrary, that the Imperial German Government accept, as of course, the rule that the lives of non-combatants, whether they be of neutral citizenship or citizens of one of the nations at war, cannot lawfully or rightfully be put in jeopardy by the capture or destruction of an unarmed merchantman, and recognize also, as all other nations do, the obligation to take the usual precaution of visit and search to ascertain whether a suspected merchantman is in fact of belligerent nationality or is in fact carrying contraband of war under a neutral flag." (The Secretary of State, Washington, D. C., to the German Minister for Foreign Affairs, May 13, 1915.) "The fact that more than one hundred American citizens were among those who perished" (reference to the sinking of the Lusitania) "made it the duty of the Government of the United States to speak of these things and once more, with solemn emphasis, to call the attention of the Imperial German Government to the grave responsibility which the Government of the United States conceives that it has incurred in this tragic occurrence, and to the indisputable principle upon which that responsibility rests. The Government of the United States is contending for something much greater than mere rights of property or privileges of commerce. It is contending for nothing less high and sacred than the rights of humanity, which every government honors itself in respecting and which no government is justified in resigning on behalf of those under its care and authority." (The Secretary of State, Washington, D. C., to the German Minister for Foreign Affairs, June 9, 1915.)