IV BREACH OF BLOCKADE
See the literature quoted above at the commencement of § [368].
Definition of Breach of Blockade.
§ 383. Breach or violation of blockade is the unallowed ingress or egress of a vessel in spite of the blockade. The attempted breach is, so far as punishment is concerned, treated in the same way as the consummated breach, but the practice of States has hitherto differed with regard to the question at what time and by what act an attempt to break a blockade commences.
It must be specially observed that the blockade-runner violates International Law as little as the contraband carrier. Both (see below, § [398]) violate injunctions of the belligerent concerned.
No Breach without Notice of Blockade.
§ 384. Since breach of blockade is, from the standpoint of the blockading belligerent, a criminal act, knowledge on the part of a vessel of the existence of a blockade is essential for making her egress or ingress a breach of blockade.
It is for this reason that Continental theory and practice have never considered a blockade established without local and diplomatic notification, so that every vessel might have, or might be supposed to have, notice of the existence of a blockade. And for the same reason some States, as France and Italy, have never considered a vessel to have committed a breach of blockade unless a special warning was given her before her attempted ingress by one of the blockading cruisers stopping her and recording the warning upon her log-book.[771]
British, American, and Japanese practice regarding the necessary knowledge of the existence of a blockade on the part of a vessel has always made a distinction between actual and constructive notice, no breach of blockade having been held to exist without either the one or the other.[772] Actual notice has been considered knowledge acquired by a direct warning from one of the blockading men-of-war or knowledge acquired from any other public or private source of information. Constructive knowledge has been presumed knowledge of the blockade on the part of a vessel on the ground either of notoriety or of diplomatic notification. The existence of a blockade has always been presumed to be notorious to vessels within the blockaded ports, but it has been a question of fact whether it was notorious to other vessels. And knowledge of the existence of a blockade has always been presumed on the part of a vessel in case sufficient time had elapsed after the home State of the vessel had received diplomatic notification of the blockade, so that it could inform thereof all vessels sailing under its flag, whether or no they had actually received, or taken notice of, the information.[773]