Civilian volunteers, militias and reorganised retreating units held out against German forces in the Polish capital, Warsaw, until 28 September, and the Modlin Fortress, north of Warsaw, surrendered the next day after an intense sixteen-day battle.
Voluntarios civís, milicias e unidades en retirada reorganizadas resistiron contra as forzas alemás na capital polaca , Varsovia, ata o día 28, e a fortaleza de Modlin, ao norte da capital, rendeuse o día seguinte despois dunha intensa batalla de 16 días.