The essays defend a 1915 British Order in Council that expanded contraband and blockade measures as reprisals during the submarine campaign, arguing that belligerents retain broad rights to search, stop, and restrict neutral trade where necessary to defeat the enemy. The author responds to neutral protests—especially from the United States—contending that neutrals should not insist on altering belligerent measures during hostilities, that alleged injuries to neutral commerce are better resolved by arbitration and compensation after the war, and that international law governs relations with neutrals but does not unduly limit legitimate methods of warfare unless conventions or humanitarian law are violated.