Mikhail Tukhachevsky orders the use of chemical weapons against the Tambov Rebellion, bringing an end to the peasant uprising.

Mikhail Nikolayevich Tukhachevsky, nicknamed the Red Napoleon, was a Soviet general who was prominent between 1918 and 1937 as a military officer and theoretician. He was later executed during the Moscow trials of 1936–1938.

A chemical weapon (CW) is a specialized munition that uses chemicals formulated to inflict death or harm on humans. According to the Organisation for the Prohibition of Chemical Weapons (OPCW), this can be any chemical compound intended as a weapon "or its precursor that can cause death, injury, temporary incapacitation or sensory irritation through its chemical action. Munitions or other delivery devices designed to deliver chemical weapons, whether filled or unfilled, are also considered weapons themselves."

The Tambov Rebellion of 1920–1922 was one of the largest and best-organized peasant rebellions challenging the Bolshevik government during the Russian Civil War. The uprising took place in the territories of the modern Tambov Oblast and part of the Voronezh Oblast, less than 500 kilometres (300 mi) southeast of Moscow.

June 12 is the 163rd day of the year in the Gregorian calendar; 202 days remain until the end of the year.