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The Battle of Westerplatte, 1939: seven days that opened the Second World War

Second World War, invasion of Poland · 1 to 7 September 1939 · Poland vs Germany · ~5 min read · Updated October 2026

The German battleship Schleswig-Holstein shelling Westerplatte, September 1939

At a glance

Polish Military Transit DepotMaj. Henryk Sucharski; Capt. Franciszek Dąbrowski
vs
Nazi GermanyForces including the battleship Schleswig-Holstein
Date
1 to 7 September 1939
Location
Westerplatte peninsula, at the mouth of the port of Danzig (Gdańsk)
Period
Second World War, invasion of Poland
Outcome
German victory; Polish garrison surrendered after seven days
By the numbers
SideStrengthLosses
PolandAbout 200 soldiers15 killed, several dozen wounded (figures vary)
GermanySeveral thousand troops, a battleship and aircraftEstimates vary; dozens or more killed

Figures, especially German losses, vary between sources.

Quick answer

The Battle of Westerplatte was fought from 1 to 7 September 19391, when about 200 Polish soldiers under Major Henryk Sucharski defended a small military depot2 at the mouth of the port of Danzig. The German battleship Schleswig-Holstein opened fire on the morning of 1 September, in shots often described as the first of the Second World War in Europe. Under shelling and bombing the garrison held out for seven days before surrendering, and Westerplatte became a lasting symbol of Polish resistance.

Before dawn on 1 September 1939 the old German battleship Schleswig-Holstein, moored in Danzig harbour on a supposed courtesy visit, opened fire on the Polish depot at Westerplatte. Its defenders had been told to hold for twelve hours.1 They held for seven days.

A Polish outpost in Danzig

Between the wars Danzig was a Free City under the League of Nations, and Poland was allowed to keep a small Military Transit Depot on the Westerplatte peninsula at the harbour mouth. Its garrison was limited by treaty, but by 1939 it had quietly been strengthened to about 200 men and fortified with guardhouses and bunkers3.

Old printed map of the Danzig area with the coast, the Vistula delta and boundary lines
Official 1920 map of the territory of the Free City of Danzig, from the maps issued with the Versailles peace treaty. Public domain

The first shots

At about 4:45 to 4:48 in the morning4 on 1 September the Schleswig-Holstein opened fire at close range, and German assault troops attacked. They were thrown back. The shots fired at Westerplatte are often called the first of the Second World War in Europe, although the bombing of the town of Wieluń began at almost the same time5.

A week under fire

For seven days the garrison under Henryk Sucharski and his deputy Franciszek Dąbrowski beat off repeated attacks while enduring naval gunfire, artillery and dive-bomber raids4. Polish radio's reports that Westerplatte was still fighting became a source of pride across the country.

Small concrete guardhouse among trees with a Polish flag and two large shells by the steps
Guardhouse No. 1 of the Polish depot at Westerplatte, built between the wars and preserved today, photographed in 2009. Tomasz Przechlewski, CC BY 2.0
Told to hold for twelve hours, Westerplatte held for seven days.

Surrender

By 7 September, with wounded men untreated, ammunition running low and no hope of relief, Sucharski surrendered6. The German commander allowed him to keep his sword in recognition of the defence1. Fifteen of the defenders had been killed and dozens wounded7.

Why Westerplatte matters

Westerplatte had little effect on the course of the invasion, but it became one of the most powerful symbols in Polish memory: a tiny garrison standing firm against overwhelming force at the very start of the war. Today a monument stands on the site, and ceremonies there mark the anniversary of the outbreak of the war each year.

Tall granite monument with carved soldier figures standing against a blue sky
The Monument to the Defenders of the Coast at Westerplatte, photographed in 2007. Public domain

Frequently asked questions

When was the Battle of Westerplatte?

It was fought from 1 to 7 September 1939.

Was Westerplatte the first battle of World War II?

It is often described as the opening battle of the war in Europe; the battleship Schleswig-Holstein opened fire at about 4:45 to 4:48 on 1 September, almost the same time as the bombing of Wieluń.

How many Polish soldiers defended Westerplatte?

About 200, under Major Henryk Sucharski.

How long did Westerplatte hold out?

Seven days, from 1 to 7 September 1939, although the garrison had been expected to hold for only about twelve hours.

Why is Westerplatte important?

It became a lasting symbol of Polish courage and resistance at the very start of the Second World War.

Sources and notes

Numbered notes in the text point to the works below.

  1. dzieje.pl (Muzeum Historii Polski / PAP), “78 lat temu po bohaterskiej walce skapitulowało Westerplatte” ↩ a b c
  2. Andrzej Drzycimski, Major Henryk Sucharski (Zakład Narodowy im. Ossolińskich, 1990). ↩
  3. Andrzej Drzycimski, Westerplatte, vol. 1: Reduta w budowie 1926–1939; vol. 2: Reduta wojenna 1939 (Fundacja Gdańska, 2014). ↩
  4. Instytut Pamięci Narodowej (IPN), “Westerplatte – symbol prawdy i odpowiedzialności” ↩ a b
  5. dzieje.pl (Muzeum Historii Polski / PAP), “Obchody 75. rocznicy wybuchu II wojny światowej i zbombardowania Wielunia” ↩
  6. Halik Kochanski, The Eagle Unbowed: Poland and the Poles in the Second World War (Harvard University Press, 2012). ↩
  7. Museum of the Second World War in Gdańsk, “Polish Army Soldiers' Cemetery at Westerplatte” ↩
  8. Wikipedia, “Battle of Westerplatte”
  9. Wikipedia, “Obrona Westerplatte”

Hold Westerplatte

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