MAPS OF HISTORY · ON THIS DAY · March 18 · 1921
ON THIS DAY · 18 MARCH 1921
The Peace of Riga
18 Mar 1921 — Poland and Soviet Russia split the borderlands between them; the line holds until 1939. Millions of Ukrainians and Belorussians wake up on the wrong side of somebody’s new border.
THE MOMENT IN CONTEXT
With the great White armies broken, 1920 brought two last acts — one to the west, one to the south. In the west, the new Poland and Soviet Russia collided over the borderlands between them. Piłsudski struck first, taking Kiev in May (one arrow), hoping to build a federation of nations between Poland and Russia. The Red Army hurled him back and kept coming: Tukhachevsky’s armies drove for Warsaw under a banner of exporting revolution — “over the corpse of White Poland shines the road to world conflagration.” For a few weeks in August it looked as if the revolution would march into Germany.
From Chapter 10 — 1920 — Warsaw and the Crimea of The Russian Revolution, 1905–1924 (OCT 1920).
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TEACH THIS IN 5 MINUTES
- Why it happened — Two enemies the Reds could not fight at once. Wrangel survived as long as he did precisely because the Polish war pinned the Red Army in the west — a last illustration of the whole war’s logic…
- The turn — The Miracle on the Vistula, August 1920. The battle that stopped the revolution at Europe’s door. Tukhachevsky’s exhausted, overextended armies were split by Piłsudski’s flank counterstroke…
- What it changed — A border drawn to 1939. The Peace of Riga split the contested borderlands between Poland and Soviet Russia and held for eighteen years — until, in September 1939, two…
Then ask the room: The Miracle on the Vistula — Piłsudski’s genius or Tukhachevsky’s blunder? And what did stopping the Red Army at Warsaw decide? The argued answer is on the chapter page →
THE ATLAS THAT SHOWS IT
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