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.
1st Guards Reserve Division (German Empire) The 1st Guard Reserve Division ("1. Garde-Reserve-Division") was a reserve infantry division of the Imperial German Army in World War I. It was a reserve formation of the Prussian Guards, the elite regiments raised throughout the Kingdom of Prussia. It was formed on mobilization in August 1914 as part of the Guards Reserve Corps and dissolved in 1919 during the demobilization of the German Army after the Armistice.