Land mine invention by the Polish officer Józef Kosacki. His invention, known as the Polish mine detector, was used by the Allies alongside mechanical methods, to clear the German mine fields during the Second Battle of El Alamein when 500 units were shipped to Field Marshal Montgomery's Eighth Army. The Nazis used captured civilians who were chased across minefields to detonate the explosives. According to Laurence Rees "Curt von Gottberg, the SS-Obergruppenführer who, during 1943, conducted another huge anti-partisan action called Operation Kottbus on the eastern border of Belarus, reported that 'approximately two to three thousand local people were blown up in
Battle of the Oder–Neisse of the Marshals of Soviet Union Konstantin Rokossovsky's 2nd Belorussian Front, Georgy Zhukov's 1st Belorussian Front and Ivan Konev's 1st Ukrainian Front, that assaulted the defending Wehrmacht Army Group Vistula commanded by Colonel-General (Generaloberst) Gotthard Heinrici and Field Marshal Ferdinand Schörner's Army Group Centre. Most of the fighting took place during 1st Belorussian Front's assault on the Seelow Heights, that were defended by the German 9th Army (part of Army Group Vistula), in what became known as the "Battle of the Seelow Heights". 1st Ukrainian Front encountered much lighter resistance crossing the Neisse to penetrate defensive lines of Army Group