It was abandoned in 1941, ending up in the Brest Fortress on the eve of the Great Patriotic War. He has only 20 days to change the course of history. In the three weeks remaining before Hitler's attack on the USSR, will a colonel of the Russian Army be able to train Red Army soldiers according to the program of airborne assault units of the future? Will this “assault armored infantry”, clad in body armor, armed with machine guns and silent sniper rifles with Bramite devices, stand up in close combat against Wehrmacht veterans? Will our contemporary be able to break through the blockade of the Brest Fortress and save the “immortal garrison”?