August 6, 1915. After several unsuccessful attempts to assault the positions of the Russian army, the command of the German troops is decided on a new one. On the eve of the attack on the position of the Germans deliver cylinders with chlorine. Lieutenant Kotlinsky accidentally learns about the upcoming use of chemical weapons, but he does not have the time and opportunity to protect his people. All that remains for him is to set up a company to fight to the last.

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