GUNS AND THEIR HISTORY: BATTLE OF WIZNA

Between 7 and 10 September 1939 the battle of Wizna took place. It was liberated between the German army and the forces of Poland, at the beginning of the Invasion of Poland.

It is is sometimes referred to as the Polish Thermopylae because a small force of this country resisted for three days in a small fortified area before a German army numerically very superior before being annihilated: in total about 42,000 men and 350 tanks against an unequal strength of 700 Poles equipped with heavy machine guns and anti-tank weapons. 

original post published by DENIX on their website