The Soviet Red Army's invasion of Eastern Poland on 17 September, in accordance with a secret protocol of the Molotov–Ribbentrop Pact, rendered the Polish plan of defence obsolete.
As the Wehrmacht advanced, Polish forces withdrew from their forward bases of operation close to the Polish–German border to more established lines of defence to the east.
After the mid-September Polish defeat in the Battle of the Bzura, the Germans gained an undisputed advantage.
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From left to right: Luftwaffe preparing to bomb Wieluń, SMS Schleswig-Holstein attacking the Westerplatte, Wehrmacht soldiers destroying the Polish-German border post, German tank and armored car formation, German and Soviet troops shaking hands following the invasion, Bombing of Warsaw.