The pocket contained two fairly capable airfields at Demyansk and Peski.
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At the time it was based at Ryelbitzi, west of Lake Ilmen covering the battles around Demyansk Pocket as the Soviets continued to try and break through the German forces in front of Leningrad.
In January 1942, Perro with small group of Latvian soldiers was trapped near Demyansk pocket, at Kholm.
In the spring of 1942, he received a severe leg wound in fighting the Red Army near Lake Ilmen in the Demyansk Pocket in Novgorod Oblast, U.S.S.R.