France . They thus eagerly seized the opportunity to encircle the Polish forces west of the Vistula . The pincer movement on Warsaw closed rapidly , and the outer pincer was completed on 12 September when Guderian 's Panzers reached Brest Litovsk . Although the Poles tenaciously defended the Westerplatte , the strip of land protecting the entrance to Danzig harbour , and mounted a counter-offensive across the river Bzura which forced General Blaskowitz 's 8th Army to divert troops away from the advance on Warsaw...











SUBJECTS

