Depôts and Factories on Neutral Territory.
§ 329. Although according to the present intense conception of the duty of impartiality neutrals need not[623] prohibit their subjects from supplying belligerents with arms and the like in the ordinary way of trade, a neutral must[624] prohibit belligerents from erecting and maintaining on his territory depôts and factories of arms, ammunition, and military provisions. However, belligerents can easily evade this by not keeping depôts and factories, but contracting with subjects of the neutral concerned in the ordinary way of trade for any amount of arms, ammunition, and provisions.[625]
[624] See Bluntschli, § 777, and Kleen, I. § 114.
[625] The distinction made by some writers between an occasional supply on the one hand, and, on the other, an organised supply in large proportions by subjects of neutrals, and the assertion that the latter must be prohibited by the neutral concerned, is not justified. See below, § [350].
Levy of Troops, and the like.
§ 330. In former centuries neutrals were not required to prevent belligerents from levying troops on their neutral territories, and a neutral often used to levy troops himself on his territory for belligerents without thereby violating his duty of impartiality as understood in those times. In this way the Swiss Confederation frequently used to furnish belligerents, and often both parties, with thousands of recruits, although she herself always remained neutral. But at the end of the eighteenth century a movement was started which tended to change this practice. In 1793 the United States of America interdicted the levy of troops on her territory for belligerents, and by-and-by many other States followed the example. During the nineteenth century the majority of writers maintained that the duty of impartiality must prevent a neutral from allowing the levy of troops. The few[626] writers who differed made it a condition that a neutral, if he allowed such levy at all, must allow it to both belligerents alike. The controversy is now finally settled, for articles 4 and 5 of Convention V. lay down the rules that corps of combatants may not be formed, nor recruiting offices opened, on the territory of a neutral Power, and that neutral Powers must not allow these acts.
[626] See, for instance, Twiss, II. § 225, and Bluntschli, § 762.
The duty of impartiality must likewise prevent a neutral from allowing a belligerent man-of-war reduced in her crew to enrol sailors in his ports, with the exception of such few men as are absolutely necessary to navigate the vessel to the nearest home port.[627]
[627] See article 18 of Convention XIII. and below, §[ 333 (3)], and § [346].