And now I come to the last point of all, blockade, which is the supreme manifestation of force at sea for the purpose of crushing the enemy. Here all minor considerations vanish. The artificial distinction between absolute and conditional contraband disappears; there is no longer any free list; neutral as well as enemy cargoes are subject to seizure, whether going to or coming from the blockaded port. The humanitarian concession that war is not made on the civil population finds no place; indeed, blockade derives much of its efficacy from the pressure which the strangling process brings to bear on that population. It has been described as a siege carried on at sea, but under somewhat more elastic conditions than a land siege. It is a convenient comparison, because all the outcry against its inhumanity is silenced by the recollection of Paris in 1870, and the vision of what Paris would have been in 1914 if the German plan had succeeded. It is rigorous, almost brutal, but it is war, and war admits of no half-measures which come within the code of civilisation; and this measure, extreme though it be, has long been recognised as legitimate warfare. Nor is there any conventional limitation as to the time when it may be resorted to. Coming as it naturally does at the end of the discussion to which other principles have led up, it might appear as if custom had decreed that it should only be resorted to after all other measures had failed. But there is nothing to prevent a war starting with a blockade; nothing, that is to say, in the theory of the subject, though there are any number of practical reasons which make it improbable. I presume, however, that if a great maritime Power were at war with a State which had only a miniature fleet, a blockade of its coasts would be the speediest and, therefore, the most humane way of bringing it to a conclusion. Certainly there is no rule or custom which prevents a Power at war from putting forth its full strength at once.