As a senior artillery officer on the coastal defense battleship Admiral Ushakov, N.N. Dmitriev spent many months of dangerous ocean sailing and witnessed the complete defeat of Z.P. Rozhdestvensky's squadron in the daytime battle on May 14, followed by night attacks by Japanese destroyers and the heroic battle of Admiral Ushakov with two Japanese armored cruisers, significantly superior to him in its fighting power. After reading these memoirs, the reader learns about the little-known facts of the campaign of Rear Admiral N.I. Nebogatov's squadron.