Russo-Japanese War (1904-05), military conflict in which a victorious Japan forced Russia to abandon its expansionist policy in the Far East, becoming the first Asian power in modern times to defeat a European power.
The Russo-Japanese War developed out of the rivalry between Russia and Japan for dominance in Korea and Manchuria. In 1898 Russia had pressured China into granting it a lease for the strategically important port of Port Arthur (now Lü-shun), at the tip of the Liaotung Peninsula, in southern Manchuria. Russia thereby entered into occupation of the peninsula, even though, in concert with other European powers, it had forced Japan to relinquish just such a right after the latter's decisive victory over China in the Sino-Japanese War of 1894-95. Moreover, in 1896 Russia had concluded an alliance with China against Japan and, in the process, had won rights to extend the Trans-Siberian Railroad across Chinese-held Manchuria to the Russian seaport of Vladivostok, thus gaining control of an important strip of Manchurian territory.
However, though Russia had built the Trans-Siberian Railroad (1891-1904), it still lacked the transportation facilities necessary to reinforce its limited armed forces in Manchuria with sufficient men and supplies. Japan, by contrast, had steadily expanded its army since its war with China in 1894 and by 1904 had gained a marked superiority over Russia in the number of ground troops in the Far East. After Russia reneged in 1903 on an agreement to withdraw its troops from Manchuria, Japan decided it was time to attack.
The war began on Feb. 8, 1904, when the main Japanese fleet launched a surprise attack and siege on the Russian naval squadron at Port Arthur. In March the Japanese landed an army in Korea that quickly overran that country. In May another Japanese army landed on the Liaotung Peninsula, and on May 26 it cut off the Port Arthur garrison from the main body of Russian forces in Manchuria. The Japanese then pushed northward, and the Russian army fell back to Mukden (now Shen-yang) after losing battles at Fu-hsien (June 14) and Liao-yang (August 25), south of Mukden. In October the Russians went back on the offensive with the help of reinforcements received via the Trans-Siberian Railroad, but their attacks proved indecisive owing to poor military leadership.
The Japanese had also settled down to a long siege of Port Arthur after several very costly general assaults on it had failed. The garrison's military leadership proved divided, however, and on Jan. 2, 1905, in a gross act of incompetence and corruption, Port Arthur's Russian commander surrendered the port to the Japanese without consulting his officers and with three months' provisions and adequate supplies of ammunition still in the fortress.
The final battle of the land war was fought at Mukden in late February and early March 1905, between Russian forces totaling 330,000 men and Japanese totaling 270,000. After long and stubborn fighting and heavy casualties on both sides, the Russian commander, General A.N. Kuropatkin, broke off the fighting and withdrew his forces northward from Mukden, which fell into the hands of the Japanese. Losses in this battle were exceptionally heavy, with approximately 89,000 Russian and 71,000 Japanese casualties.
The naval Battle of Tsushima finally gave the Japanese the upper hand in the conflict. The Japanese had been unable to secure the complete command of the sea on which their land campaign depended, and the Russian squadrons at Port Arthur and Vladivostok had remained moderately active. But on May 27-29, 1905, in a battle in the Tsushima Straits, Admiral Togo Heihachiro's main Japanese fleet destroyed the Russian Baltic Fleet, which, commanded by Admiral Z.P. Rozhestvensky, had sailed in October 1904 all the way from the Baltic port of Liepaja to relieve the forces at Port Arthur and at the time of the battle was trying to reach Vladivostok. (See Tsushima, Battle of.) Japan was by this time financially exhausted, but its decisive naval victory at Tsushima, together with increasing internal political unrest throughout Russia, where the war had never been popular, brought the Russian government to the peace table.
President Theodore Roosevelt of the United States served as mediator at the peace conference, which was held at Portsmouth, N.H., U.S. (Aug. 9-Sept. 5, 1905). In the resulting Treaty of Portsmouth, Japan gained control of the Liaotung Peninsula (and Port Arthur) and the South Manchurian railroad (which led to Port Arthur), as well as half of Sakhalin Island. Russia agreed to evacuate southern Manchuria, which was restored to China, and Japan's control of Korea was recognized. Within two months of the treaty's signing, a revolution compelled the Russian tsar Nicholas II to issue the October Manifesto, which was the equivalent of a constitutional charter.
The Russo-Japanese War (8 February 1904 – 5 September 1905) was "the first great war of the 20th century."[4] It grew out of rivalimperial ambitions of the Russian Empire and the Empire of Japan over Manchuria and Korea. The major theatres of operations were Southern Manchuria, specifically the area around the Liaodong Peninsula and Mukden; and the seas around Korea, Japan, and theYellow Sea.

Declaration of war
Greater Manchuria. Russian (outer) Manchuria is the lighter red region to the upper right.
In 1904 Jacob Schiff extended a critical series of loans to the Empire of Japan in the amount of $200 million. He was willing to extend this loan due, in part, to his belief that gold is not as important as national effort and desire, in helping win a war, and due to the apparent underdog status of Japan at the time; no European nation had yet been defeated by a non-European nation in a modern, full-scale war. It is quite likely Schiff also saw this loan as a means of avenging, on behalf of the Jewish people, the anti-Semitic actions of the Tsarist regime, specifically the then-recent pogroms in Kishinev.[18]
Japan issued a declaration of war on 8 February 1904.[19] However, three hours before Japan's declaration of war was received by the Russian Government, the Japanese Imperial Navy attacked the Russian Far East Fleet at Port Arthur. Tsar Nicholas II was stunned by news of the attack. He could not believe that Japan would commit an act of war without a formal declaration, and had been assured by his ministers that the Japanese would not fight. Russia declared war on Japan eight days later.[20] Japan, in response, made reference to the Russian attack on Sweden in 1809 without declaration of war, and the requirement to declare war before commencing hostilities was not made international law until the Second Hague Peace Conference was held in October 1907.[21]
In addition, the Principality of Montenegro declared war against Japan in solidarity, out of gratitude for Russia's recent aid in its struggle against theOttoman Empire during the Montenegrin–Ottoman War (1876–78). However, for reasons of logistics and immense distance, including Montenegro's effective lack of any naval capabilities, actual contribution to the war effort was limited to Montenegrins serving in the Russian armed forces as volunteers in Manchuria.[22][23] The war between Montenegro and Japan was extended by diplomatic irregularity until 2006.
The Qing empire favored the Japanese position and even offered military aid, but Japan declined it. However, Yuan Shikai sent envoys to Japanese generals several times to deliver foodstuffs and alcoholic drinks. Native Manchurians joined the war on both sides as hired troops.

Campaign of 1904 Port Arthur, on the Liaodong Peninsula in the south of Manchuria, had been fortified into a major naval base by the Russian Imperial Army. Since it needed to control the sea in order to fight a war on the Asian mainland, Japan's first military objective was to neutralize the Russian fleet at Port Arthur.

Battle of Port Arthur
On the night of 8 February 1904, the Japanese fleet under Admiral Togo Heihachiro opened the war with a surprise torpedo boat destroyer[24] attack on the Russian ships at Port Arthur. The attack badly damaged the Tsesarevich and Retvizan, the heaviest battleships in Russia's far Eastern theater, and the 6,600 ton cruiser Pallada.[25] These attacks developed into theBattle of Port Arthur the next morning. A series of indecisive naval engagements followed, in which Admiral Togo was unable to attack the Russian fleet successfully as it was protected by the shore batteries of the harbor, and the Russians were reluctant to leave the harbor for the open seas, especially after the death of Admiral Stepan Osipovich Makarov on 13 April 1904.
However, these engagements provided cover for a Japanese landing near Incheon in Korea. From Incheon the Japanese occupied Seoul and then the rest of Korea. By the end of April, the Japanese Imperial Army under Kuroki Itei was ready to cross the Yalu river into Russian-occupied Manchuria.
Battle of chemulpo bay
Shows the crew of a Japanese battleship working a gun during the engagement of Chemulpo Bay. The Russian cruiser "Variag," and gunboat "Koreitz," are seen coming out of the harbor. As soon as they appear in the open sea they are attacked by the Japanese fleet, and after receiving a fierce fire from the enemy's guns, they endeavor to return to port, but both sink before reaching the bay.
Battle of Yalu River
In contrast to the Japanese strategy of rapidly gaining ground to control Manchuria, Russian strategy focused on fighting delaying actions to gain time for reinforcements to arrive via the longTrans-Siberian railway, which was incomplete near Irkutsk at the time. On 1 May 1904, the Battle of Yalu River became the first major land battle of the war; Japanese troops stormed a Russian position after crossing the river. The defeat of the Russian Eastern Detachment removed the perception that the Japanese would be an easy enemy, that the war would be short, and that Russia would be the overwhelming victor.[26] Japanese troops proceeded to land at several points on the Manchurian coast, and in a series of engagements drove the Russians back towards Port Arthur. The subsequent battles, including the Battle of Nanshan on 25 May 1904, were marked by heavy Japanese losses largely from attacking entrenched Russian positions.

Campaign of 1905
With the fall of Port Arthur, the Japanese 3rd army was now able to continue northward and reinforce positions south of Russian-held Mukden. With the onset of the severe Manchurian winter, there had been no major land engagements since the Battle of Shaho the previous year. The two sides camped opposite each other along 60 to 70 miles (110 km) of front lines, south of Mukden.
Battle of Sandepu
The Russian Second Army under General Oskar Gripenberg, between 25 and 29 January, attacked the Japanese left flank near the town of Sandepu, almost breaking through. This caught the Japanese by surprise. However, without support from other Russian units the attack stalled, Gripenberg was ordered to halt by Kuropatkin and the battle was inconclusive. The Japanese knew that they needed to destroy the Russian army in Manchuria before Russian reinforcements arrived via the Trans-Siberian railroad.
Battle of Mukden
The Battle of Mukden commenced on 20 February 1905. In the following days Japanese forces proceeded to assault the right and left flanks of Russian forces surrounding Mukden, along a 50-mile (80 km) front. Approximately half a million men were involved in the fighting. Both sides were well entrenched and were backed by hundreds of artillery pieces. After days of harsh fighting, added pressure from the flanks forced both ends of the Russian defensive line to curve backwards. Seeing they were about to be encircled, the Russians began a general retreat, fighting a series of fierce rearguard actions, which soon deteriorated in the confusion and collapse of Russian forces. On 10 March 1905 after three weeks of fighting, General Kuropatkin decided to withdraw to the north of Mukden. The Russians lost 90,000 men in the battle.
The retreating Russian Manchurian Army formations disbanded as fighting units, but the Japanese failed to destroy them completely. The Japanese themselves had suffered large casualties and were in no condition to pursue. Although the battle of Mukden was a major defeat for the Russians and was the most decisive land battle ever fought by the Japanese, the final victory still depended on the navy.
Battle of Tsushima
The Russian Second Pacific Squadron (the renamed Baltic Fleet) sailed 18,000 nautical miles (33,000 km) to relieve Port Arthur. The demoralizing news that Port Arthur had fallen reached the fleet while it was still atMadagascar. Admiral Rozhestvensky's only hope now was to reach the port of Vladivostok. There were three routes to Vladivostok, with the shortest and most direct passing through Tsushima Straits between Korea and Japan. However, this was also the most dangerous route as it passed between the Japanese home islands and the Japanese naval bases in Korea.
Admiral Togo was aware of Russian progress and understood that, with the fall of Port Arthur, the Second and Third Pacific Squadrons would try to reach the only other Russian port in the Far East, Vladivostok. Battle plans were laid down and ships were repaired and refitted to intercept the Russian fleet.
The Japanese Combined Fleet, which had originally consisted of six battleships, was now down to four (two had been lost to mines), but still retained its cruisers, destroyers, and torpedo boats. The Russian Second Pacific Squadron contained eight battleships, including four new battleships of theBorodino class, as well as cruisers, destroyers and other auxiliaries for a total of 38 ships.
By the end of May the Second Pacific Squadron was on the last leg of its journey to Vladivostok, taking the shorter, riskier route between Korea and Japan, and travelling at night to avoid discovery. Unfortunately for the Russians, while in compliance with the rules of war, the two trailing hospital ships had continued to burn their lights,[36] which were spotted by the Japanese armed merchant cruiser Shinano Maru. Wireless communication was used to inform Togo's headquarters, where the Combined Fleet was immediately ordered to sortie.[37] Still receiving naval intelligence from scouting forces, the Japanese were able to position their fleet so that they would "cross the T"[38] of the Russian fleet. The Japanese engaged battle in the Tsushima Straits on 27–28 May 1905. The Russian fleet was virtually annihilated, losing eight battleships, numerous smaller vessels, and more than 5,000 men, while the Japanese lost three torpedo boats and 116 men. Only three Russian vessels escaped to Vladivostok. After the Battle of Tsushima, the Japanese army occupied the entire chain of the Sakhalin Islands to force the Russians to sue for peace.

List of battles
1904 Battle of Port Arthur, 8 February: naval battle Inconclusive
1904 Battle of Chemulpo Bay, 9 February: naval battle Japanese victory
1904 Battle of Yalu River, 30 April to 1 May: Japanese victory
1904 Battle of Nanshan, 25 to 26 May, Japanese victory
1904 Battle of Telissu, 14 to 15 June, Japanese victory
1904 Battle of Motien Pass, 17 July, Japanese victory
1904 Battle of Ta-shih-chiao, 24 July, Japanese victory
1904 Battle of Hsimucheng, 31 July, Japanese victory
1904 Battle of the Yellow Sea, 10 August: naval battle Japanese victory strategically/tactically inconclusive
1904 Battle off Ulsan, 14 August: naval battle Japanese victory
1904–1905 Siege of Port Arthur, 19 August to 2 January: Japanese victory
1904 Battle of Liaoyang, 25 August to 3 September: Inconclusive
1904 Battle of Shaho, 5 to 17 October: Inconclusive
1905 Battle of Sandepu, 26 to 27 January: Inconclusive
1905 Battle of Mukden, 21 February to 10 March: Japanese victory
1905 Battle of Tsushima, 27 to 28 May naval battle: Japanese victory