Taken prisoner by the Germans, he was handed over to the USSR in accordance with the Ribbentrop-Molotov Pact and then executed by the NKVD some time in 1940 during the infamous Katyn massacre.
He was captured by the Germans and transferred to the USSR in accordance with the Ribbentrop-Molotov Pact, after which he was executed by the NKVD during the infamous Katyn massacre of 1940.