During the Russo-Japanese War he served in the Red Cross and in the Municipal Union for the organization of hospitals; he was left to take care of the Russian wounded after the battle of Moukden, and showed much dignity and efficiency in the performance of his arduous duties.
One result of the Russo-Japanese War was the evacuation of Manchuria by the Russians, which, after the conclusion of peace in 1905, was handed over by Japan to China.
He believed that international controversies would ultimately be settled by judicial procedure, and in the Russo-Japanese War and the establishment of the Hague Court he took an active part in promoting the judicial settlement of disputes between nations.
For his efforts leading to the settlement of the Russo-Japanese War he received the Nobel Peace Prize, and in May 1910 he delivered an address on "International Peace" before the Nobel committee in Christiania.
Australian and Japanese trade in the archipelago was stimulated by the establishment of the Australian Commonwealth (1901) and the Russo-Japanese War (1904-5).