From 1894 to 1899, he was the Minister of War. During his tenure, the former "Kalahom" department (dating back to the 15th century) was radically modernised based on Western models. From 1896 to 1899, Prince Naris—who was both a general of the army and an admiral—additionally held the position of the Commander of the Department of Military Operation, the highest military position in the Siamese Army of that time. From 1898 to 1899 he was also the Commander of the Navy Department and therefore commanding officer of the Siamese Navy.