Nothing therefore remained but to take the respective naval commanders into counsel. The Ministers had no authority over them, but it was quickly found that the concert of admirals and captains was as perfect as that of the diplomatic body. The ships of the four Powers--Great Britain, France, United States, and Netherlands--were placed under the command of Vice-Admiral Sir Augustus Kuper, and a plan of action was settled upon.
The advance to Shimonoséki was still, however, delayed by two circumstances. The first was the return from Europe of two Japanese students, out of five who had been sent there the previous year by that very Prince of Choshiu against whom coercive measures were about to be undertaken. These young men, hearing while abroad of the proceedings of their chief, and convinced, from what they had seen in Europe, of the overwhelming resources of the Powers, that Choshiu was bringing disaster on himself in forcing battle on such antagonists, resolved to hurry back to Japan with the express object of warning their prince of his danger. The arrival of the two youths in Yedo was thought by the foreign Ministers to offer some chance of coming to terms with Choshiu without the arbitrament of arms, and accordingly facilities were afforded by Vice-Admiral Kuper for landing the two travellers at the nearest convenient point to their prince's territory. They were intrusted with overtures of peace in the form of a long memorandum from the British Minister, reviewing the whole situation, and explaining the attitude of the Powers and the hopelessness of the armed resistance of any Daimio. The messengers brought back to the rendezvous, where a light-draught vessel waited for them, an oral reply from the prince explaining his attitude and asking for three months' delay to enable Choshiu to confer with the Mikado and Tycoon, by whose orders he had done what he had done, and without whose consent he dare not change his policy. It is interesting to recall the fact that the names of the two youthful emissaries were Ito and Inouyé, who have since played so distinguished and honourable a part in the development of their country.
The second cause of suspension of action against Choshiu was the news of a convention concluded in Paris between the Japanese envoys and the French Foreign Minister, dated June 20, 1864, in which this very object of the reopening of the Straits of Shimonoséki was provided for. Were this convention to be ratified by the Tycoon the immediate cause of dispute would be removed. The matter, however, was disposed of with more than its accustomed promptitude by the Japanese Government, who curtly refused to ratify the French convention. The Tycoon's Ministers declared themselves unable to carry out the agreement, and to ratify it would merely be to add another to their too onerous obligations. Admiral Kuper was finally given a free hand on August 25, and before the middle of September the forts and ships of the recalcitrant prince were completely destroyed by the Allied squadrons, not without considerable resistance and some loss to the assailants. The action was conducted with admirable harmony among the officers engaged, and the reciprocity of compliments between the respective commanders-in-chief, especially between the French and English admirals, is edifying reading in these later days.