The siege of Port Arthur (, Ryojun Kōisen; , Oborona Port-Artura, August 1, 1904 – January 2, 1905) was the longest and most violent land battle of the Russo-Japanese War. Port Arthur, the deep-water port and Russian naval base at the tip of the Liaodong Peninsula in Manchuria, had been widely regarded as one of the most strongly fortified positions in the world. However, during the First Sino-Japanese War, General Nogi Maresuke had taken the city from the forces of Qing China in only a few days. The ease of his victory during the previous conflict, and overconfidence by the Japanese General Staff in its ability to overcome improved Russian fortifications, led to a much longer campaign and far greater losses than expected. The siege of Port Arthur saw the introduction of much technology used in subsequent wars of the 20th century (particularly in World War I) including massive 28 cm howitzers capable of hurling shells over , as well as rapid-firing light howitzers, Maxim machine guns, bolt-action magazine rifles, barbed wire entanglements, electric fences, arc lamp, searchlights, tactical radio signalling (and, in response, the first military use of radio jamming), hand grenades, extensive trench warfare, and the use of modified naval mines as land weapons. Background The Russian forces manning the defenses of Port Arthur under Major-General Baron Anatoly Stoessel consisted of almost 50,000 men and 506 guns (including the crews of the Russian warships in port). He also had the option of removing the guns from the fleet to bolster the land defenses. The total population of Port Arthur at the time was around 87,000, which meant that a very high proportion of the population were combatants. Russian improvements to the defences of Port Arthur included a multi-perimeter layout with overlapping fields of fire and making the best possible use of the natural terrain. However, many of the redoubts and fortifications were still unfinished, as considerable resources were either in very short supply or had been diverted to improving the fortifications at Dalny, further north on the Liaodong Peninsula. The outer defense perimeter of Port Arthur consisted of a line of hills, including Hsiaokushan and Takushan near the Ta-ho River in the east, and Namakoyama, Akasakayama, 174-Meter Hill, 203-Meter Hill and False Hill in the west. All of these hills were heavily fortified. Approximately behind this defensive line was the original stone Chinese wall, which encircled the Old