Battle of Warsaw
Poland throws the Red Army back from Warsaw
In August 1920 Tukhachevsky's armies reached Warsaw, but on 16 August Józef Piłsudski's strike group attacked their flank and rear from the Wieprz river, and the Red Army fell back east. The 1921 Peace of Riga drew a Soviet-Polish border that lasted until 1939.
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Meanwhile around the world (±25 years)
Whole world
- 1914–1918 World War I — 6 years earlier
- 1918–1920 Spanish flu pandemic — 2 years earlier
- 1920 League of Nations founded — same year
- 1939–1945 World War II — 19 years later
- 1943 Tehran Conference — 23 years later
Eastern Europe & Russia
- 1917 October Revolution — 3 years earlier
- 1917–1922 Russian Civil War — 3 years earlier
- 1929–1933 Collectivization in the Soviet Union — 9 years later
- 1936–1938 Great Purge — 16 years later
- 1941–1944 Siege of Leningrad — 21 years later
Middle East
- 1908 Oil struck at Masjed Soleyman — 12 years earlier
- 1915–1917 Armenian genocide — 5 years earlier
- 1916 Sykes–Picot Agreement — 4 years earlier
- 1917 Balfour Declaration — 3 years earlier
- 1919–1922 Greco-Turkish War — 1 year earlier
Africa
- 1898 Battle of Omdurman — 22 years earlier
- 1899–1902 Second Boer War — 21 years earlier
- 1904–1908 The Herero and Nama genocide — 16 years earlier
- 1922 Discovery of Tutankhamun's tomb — 2 years later
- 1935–1937 Italy invades Ethiopia — 15 years later
Asia
- 1910 Japan annexes Korea — 10 years earlier
- 1911–1912 Xinhai Revolution — 9 years earlier
- 1919 Amritsar massacre — 1 year earlier
- 1923 Great Kantō earthquake — 3 years later
- 1945 Atomic bombing of Hiroshima — 25 years later
Americas
- 1910–1920 Mexican Revolution — 10 years earlier
- 1913 Ford's moving assembly line — 7 years earlier
- 1914 Opening of the Panama Canal — 6 years earlier
- 1914 Death of Martha, the last passenger pigeon — 6 years earlier
- 1929 Wall Street Crash and the Great Depression — 9 years later
Oceania
- 1911 Amundsen reaches the South Pole — 9 years earlier
- 1912 The death of Scott's polar party — 8 years earlier
- 1936 Death of the last thylacine — 16 years later
- 1941 Attack on Pearl Harbor — 21 years later
- 1942 The Battle of Midway — 22 years later
Alive at the time
- Thomas Edison (aged 73)
- Nikola Tesla (aged 64)
- Marie Curie (aged 53)
- Mahatma Gandhi (aged 51)
- Vladimir Lenin (aged 50)
- Ernest Rutherford (aged 49)
- Winston Churchill (aged 46)
- Joseph Stalin (aged 42)
- Albert Einstein (aged 41)
- Pablo Picasso (aged 39)