On July 14, 1941, the BM-13 combat launcher, better known as the Katyusha, fired the first salvo at the railway junction of the city of Orsha,


Theophilanbo
 
On July 14, 1941, the BM-13 combat launcher, better known as the Katyusha, fired the first salvo at the railway junction of the city of Orsha,
Source
Katyusha Weapon Victory the USSR
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