"Reimar Constantin von Alvensleben (26 August 1809 – 28 March 1892) was a Prussian (and later Imperial German) general.
Born at Eichenbarleben in the Province of Saxony, Alvensleben entered the Prussian Guards from the cadet corps in 1827. He became first lieutenant in 1842, captain in 1849, and major on the Great General Staff in 1853, whence after seven years he went to the Ministry of War. He was soon afterwards promoted colonel, and commanded a regiment of Guard infantry up to 1864, when he became a major-general after the Second Schleswig War.
Alvensleben commanded a brigade of guards in the Austro-Prussian War of 1866. At the action of Soor (Burkersdorf) on 28 June, he distinguished himself greatly, and at the Battle of Königgrätz where he led the advanced guard of the Guards Corps, his energy and initiative were still more conspicuous. Soon afterwards he succeeded to the command of his division, General Wilhelm Hiller von Gärtringen having fallen in the battle; he was promoted lieutenant-general, and retained this command after the conclusion of peace, receiving in addition the order Pour le Mérite for his services." - (en.wikipedia.org 11.01.2020)