The 15th Infantry Division was an infantry formation of the Russian Imperial Army that existed in various formations from the early 19th century until the end of World War I and the Russian Revolution which dismantled the Tsarist autocracy and led to the rise of what?
Russian Revolution The Russian Revolution was a pair of revolutions in Russia in 1917 which dismantled the Tsarist autocracy and led to the rise of the Soviet Union. The Russian Empire collapsed with the abdication of Emperor Nicholas II and the old regime was replaced by a provisional government during the first revolution of February 1917 (March in the Gregorian calendar; the older Julian calendar was in use in Russia at the time). Alongside it arose grassroots community assemblies (called 'soviets') which contended for authority. In the second revolution that October, the Provisional Government was toppled and all power was given to the soviets.
80th Reserve Division (German Empire) The 80th Reserve Division ("80. Reserve-Division") was a unit of the Imperial German Army in World War I. The division was formed at the end of December 1914 and organized over the next month, arriving in the line in early February 1915. It was part of the second large wave of new divisions formed at the outset of World War I, which were numbered the 75th through 82nd Reserve Divisions. The division was initially part of XXXX Reserve Corps. The division was disbanded in 1919 during the demobilization of the German Army after World War I. The division was mixed in recruitment. The 264th Reserve Infantry Regiment was from Thuringia, and was described as a Saxe-Altenburg regiment. The 265th Reserve Infantry Regiment was from the Grand Duchy of Mecklenburg-Schwerin. The 266th was also formed in the Grand Duchy of Mecklenburg-Schwerin, but reportedly included recruits from Mecklenburg-Strelitz, Pomerania and other areas. The 34th Reserve Infantry Regiment, which replaced the 265th in 1915, was from West Prussia.