He joined at the age of 13 years in the Saxon army, as a Unterleutnant, in the "Kurfürst" Infantry Regiment.

In 1813 he negotiated a treaty for mutual defence with Austria; but after the Battle of Lützen (1813), the king of Saxony returned to the French fold at Dresden.

At Dresden, 26 August 1813, he was successful taking command from the wounded Major General v. Frierenberger.

Reisner gave direction to Langerau of the center and the left wing batteries, united at two points, and silenced the enemy guns.

He was Austrian Plenipotentiary, and the Chairman of the Military Central Commission of the German Federal Assembly at Frankfurt am Main, from November 1818 to 1829.