Battle of Szack (Shatsk) was one of the battles between the Polish Army and the Red Army fought in 1939 in the beginning of the Second World War. Eve of the battle During the invasion of Poland the Polish Border Defence Corps (KOP) was severely stripped of all the reserves and heavy armament. All the available Polish forces were sent to the west to reinforce the units resisting the German invasion. When the Red Army invaded Poland on 17 September, there were barely any Polish forces to oppose them. The garrisons of the KOP were overstretched and after initial clashes and skirmishes for the border forts, the Polish units had to fall back. The deputy commander of the KOP, general Wilhelm Orlik-Rueckemann decided to unite as many troops under his command as possible and join with the rest of the Polish forces in the west. He ordered all the KOP forces in Polesie area to withdraw. In several days he managed to gather approximately 9,000 men under his command, coming from various units spread along a 300-kilometre long strip of the Polish-Soviet border. On 19 September he ordered all his units to march towards Kowel, where his forces were to be joined by the Independent Operational Group Polesie under general Franciszek Kleeberg. However, the difficult situation and the outcome of the battles of Brześć and Kobryń forced Rueckemann's group to change its plans. The Polish units changed the direction and started to march through the forests towards Włodawa and Kamień Koszyrski. The group found itself in a no-man's-land between the Soviet forces and the Wehrmacht and could operate freely but the morale of the troops was low. On 27 September General Orlik-Rueckemann decided to engage the Soviet forces to achieve a victory and raise morale. Battle The Polish forces were marching in two columns. In the early morning of 28 September the northern column reached the forests near the village of Mielniki while the southern column reached the forests east of Szack (now Shatsk). Polish reconnaissance reported that the town of Shatsk was occupied by Soviet infantry and tanks. Orlik-Rueckemann ordered both columns to form a defensive line along the border of the forest and provoked the Red Army to attack. At 8 o'clock in the morning, the Soviet tank unit (composed mostly of the T-26 tanks) started a direct assault on Polish positions. The Polish forces did not open