The fundamental principle in navigating a merchantman, whether in times of peace or of war, is that the commanding officer must be left free to exercise his own judgment. Safe navigation denies the proposition that the judgment and sound discretion of the Captain of a vessel must be confined in a mental straitjacket. Of course, when movements are under military control, orders must be strictly obeyed, come what may. No such situation, however, was presented either to the Cunard Steamship Co. or Captain Turner. The vessel was not engaged in military service nor under naval convoy. True, she was, as between the German and British Governments, an enemy ship as to Germany, but she was unarmed and a carrier of not merely noncombatants, but, among others, of many citizens of the United States, then a neutral country, at peace with all the world. [Sidenote: Admiralty advices considered.] In such circumstances the Captain could not shield himself automatically against error behind a literal compliance with the general advices or instructions of the Admiralty, nor can it be supposed that the Admiralty, any more than the Cunard Steamship Co., expected him so to do. What was required of him was that he should seriously consider and, as far as practicable, follow the Admiralty advices and use his best judgment as events and exigencies occurred; and if a situation arose where he believed that a course should be pursued to meet emergencies which required departure from some of the Admiralty advices as to general rules of action, then it was his duty to take such course, if in accordance with his carefully formed deliberate judgment. After a disaster has occurred, it is not difficult for the expert to show how it might have been avoided, and there is always opportunity for academic discussion as to what ought or ought not to have been done; but the true approach is to endeavor, for the moment, to possess the mind of him upon whom rested the responsibility. [Sidenote: Enemy obligations in care of merchant ships.] Let us now see what that responsibility was and how it was dealt with. The rules of naval warfare allowed the capture and, in some circumstances, the destruction of an enemy merchant ship, but, at the same time, it was the accepted doctrine of all civilized nations (as will be more fully considered infra) that, as Lord Mersey put it, "there is always an obligation first to secure the safety of the lives of those on board." The responsibility, therefore, of Captain Turner, in his task of bringing the ship safely to port, was to give heed not only to general advices advanced as the outcome of experience in the then developing knowledge as to submarine warfare, but particularly to any special information which might come to him in the course of the voyage. [Sidenote: Advices of the Admiralty.]