The Battle of the Border (Polish: Bitwa graniczna) refers to the battles that occurred in the first days[1] of the Germaninvasion of Poland in September, 1939. The series of battles ended in a German victory, as Polish forces were either destroyed or forced to retreat.
Before the battle
The Polish defense plan (Plan Zachód) called for a defense of Poland's borders in case of invasion from Germany. Much of Poland's new industry and major population centers were located in the border area (particularly in Silesia); however, the lengthy border was very difficult to defend properly. The plan was criticized by some of the Polish military and Western advisors, but supported by politicians who feared the effect of abandoning a significant part of the population to the enemy without a fight, and who were further discouraged from abandoning those territories as the Polish allies (France and the United Kingdom) did not guarantee the Borders of Poland and might well decide to allow the Germans to take the Polish Corridor they demanded in exchange for peace (pursuing a policy of appeasement).
The German invasion plan (Fall Weiss) called for the start of hostilities before the declaration of war and for the Blitzkrieg doctrine of lightning war to be pursued. German units were to invade Poland from three directions:
from the German mainland through the western Polish border
from the territory of Slovakia, accompanied by allied Slovak units
All three assaults were to converge on Warsaw, while the main Polish army was to be encircled and destroyed west of the Vistula.
Poland, which already had a smaller population and thus a smaller military budget and army than Germany, was further disadvantaged because Poland was unsure whether the war would start already, and its armed forces were not fully mobilized by 1 September.
Battle
The Battle of the Border begun around 05:00, as German troops started crossing the Polish border in numerous places.[2] The Battle of Westerplatte, which is often described as having begun at 04:45 with the salvos of SMS Schleswig-Holstein on Polish coastal fortifications, is commonly described as the first battle of the war.[3][4] Other sources have described the 04:45 salvos as happening "minutes after Luftwaffe attacks on Polish airfields".[5] Several historians identify the first action of the war as the bombing of the key Tczew bridge in the Polish Corridor by dive bombers from Sturzkampfgeschwader 1 around 04:30.[6][7] The Polish historian Jarosław Tuliszka noted that a number of German units had started hostilities across the border before shots were fired at Westerplatte.[8]: 7–8 The false flagOperation Himmler had begun hours earlier.[9]
At 08:00 on 1 September, German troops, still without a formal declaration of war being issued, attacked near the Polish town of Mokra, and the Battle of the Border had begun. Later that day, the Germans opened fronts along Poland's western, southern and northern borders while German aircraft began raids on Polish cities. The main routes of attack led eastwards from Germany proper through the western Polish border. A second route carried supporting attacks from East Prussia in the north, and there was a co-operative German-Slovak tertiary attack by units (Field Army Bernolák) from the territory of German-allied Slovakia in the south. All three assaults converged on the Polish capital of Warsaw.
In northern Poland (Masovia), by 3 September, part of the German Third Army had defeated the Polish Army Modlin under Emil Krukowicz-Przedrzymirski at the Battle of Mława. The Polish forces retreated towards their secondary lines of defence at the Vistula and Narew rivers, which allowed the Germans to move towards their main objective, Warsaw.
Virtually all battles that are considered part of the Battle of the Border (with the exception of the Battle of Hel, which lasted for more than a month, and the Battle of Mokra, a Polish defensive victory) resulted in the rapid defeat of Polish forces, which were forced to abandon the regions of Pomerania, Greater Poland and Silesia. Those defeats, in turn, made it more difficult for the Polish forces to fall back in an organised way to the secondary lines of defence (behind the Vistula and near the Romanian Bridgehead).
List of battles
The Battle of the Border included the following battles:[1]
^ abThe Battle of the Border began on 1 September, but sources vary with their assignment of an end date for this phase of the campaign. The shortest period is delimited by the date of 3 September (Encyklopedia Internautica), usually related to the Battle of Mława, while the longer one gives the date of the 6th (Encyklopedia PWNArchived 2006-10-01 at the Wayback Machine) (the order of Edward Rydz-Śmigły to fall back) or sometimes the 7th of September (the symbolic capitulation of Westerplatte).
^David T. Zabecki (1 May 2015). World War II in Europe: An Encyclopedia. Routledge. p. 1663. ISBN978-1-135-81242-3. The earliest fighting started at 0445 hours when marines from the battleship Schleswig-Holstein attempted to storm a small Polish fort in Danzig, the Westerplate
^Lawrence Paterson (30 November 2015). Schnellboote: A Complete Operational History. Seaforth Publishing. p. 19. ISBN978-1-84832-083-3. Two minutes later the old battleship Schleswig-Holstein opened World War Two by bombarding the Polish military transit depot at Westerplatte, Danzig