Short answers, pulled from the story.
Michael Andreas Barclay de Tolly entered the world in 1761 within the Polish, Lithuanian Commonwealth. He was baptized on the 27th of December at Zaumel Lutheran church.
Michael Andreas Barclay de Tolly achieved the rank of cornet by May 1778 within the Pskov Carabineer Regiment. That same year he joined the Imperial jaeger regiments assigned to Prince Potemkin's army.
Tsar Alexander I replaced Michael Andreas Barclay de Tolly after discontent grew among Russians regarding his retreat strategy following the loss of Smolensk. Rumors spread that he acted as Napoleon's agent due to his non-Russian background while the populace condemned him as a coward.
Michael Andreas Barclay de Tolly served at Dresden between August 26 and 27, 1813 and fought in the battle at Kulm on August 29 and 30 of that same year. He commanded a central part of Allied forces effectively during the Leipzig campaign from October 16 to 19, 1813.
Michael Andreas Barclay de Tolly died in 1818 after settling down in his Jõgeveste manor located in what is now southern Estonia. His health declined significantly after victories leading him to leave active duty.