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After the Nazi attack on the Soviet Union, Ljalková joined the First Czechoslovak Independent Field Battalion as a volunteer in March 1942, aged 21, and graduated from a three-month sniper school in Buzuluk.
In the rank of lieutenant (since October 1941), Jaroš, together with other Czech officers, became a constituent member of the First Czechoslovak Independent Field Battalion in Buzuluk in 1942.