During World War II Mednoye was a centre of heavy tank fighting ( October 1941 ) which formed part of the Battle of Moscow . It also became known as a NKVD mass execution site . Between April 3 and April 19 , 1940 , 6,311 Polish officers from the Ostashkov POW camp were brought to the area of Mednoye and subsequently shot to death behind the village of Yamka during the Katyn massacre
Katyn massacre
Katyn massacre
Mednoye, Tver Oblast