In August 1914, the Russian Second Army walked into East Prussia and ceased to exist.

The Battle of Tannenberg, fought August 26-30, 1914, was one of the most complete military annihilations in modern history. General Alexander Samsonov's army — fifteen divisions, approximately 150,000 men — was encircled by a German force of inferior numbers and destroyed. Samsonov, unable to face the Kaiser, shot himself in the forest as his command collapsed around him.

Germany took 92,000 prisoners. The battle lasted five days. It was so complete that the German commanders chose its name deliberately: on the same ground in 1410, the Teutonic Knights had been destroyed by Polish and Lithuanian forces at the first Battle of Tannenberg. The 1914 victory was presented as historical redemption.

The Russian Plan

The Russian strategic situation in August 1914 was defined by Allied pressure. France was reeling from German advances through Belgium and demanding that Russia attack in the east to relieve the pressure. The Russian army, still mobilizing, was not ready. The Stavka — Russian high command — sent it anyway.

Two armies crossed into East Prussia simultaneously: the First Army under Rennenkampf moving west, the Second under Samsonov moving north. The plan was to catch the German Eighth Army between them. The problem was the Masurian Lakes — a chain of lakes and marshes that divided the two Russian armies and prevented direct communication or mutual support. The two army commanders also detested each other personally, a fact that would prove fatal.

German signals intelligence was reading Russian radio traffic in clear — unencrypted, transmitted in the open because the Russians lacked sufficient codes. German commanders knew the location, movement, and intention of both Russian armies in real time.

The German Response

The German Eighth Army's original commander, General Prittwitz, panicked after the First Army defeated his force at Gumbinnen on August 20 and telephoned Moltke, the German Chief of Staff, to announce he was retreating to the Vistula River. Moltke sacked him on the spot and sent two replacements: the recalled retiree Paul von Hindenburg as commander, and the brilliant operational mind Erich Ludendorff as chief of staff.

The plan they inherited — drawn up by Colonel Max Hoffmann before they even arrived — was already in motion. The Germans would strip their forces facing Rennenkampf to a thin screening line (gambling that Rennenkampf, as intelligence suggested, would not pursue aggressively) and mass everything against Samsonov's Second Army in the south.

The gamble on Rennenkampf's passivity was correct. He did not move.

The Encirclement

The German XX Corps under General von Scholtz fixed Samsonov's center at Orłau-Frankenau while German forces swept around both flanks. The Russian corps commanders, isolated, with poor communication and conflicting orders, could not coordinate. Samsonov's repeated requests to high command for permission to withdraw were denied.

By August 29, the encirclement was complete. The Russian center was surrounded in the Combitten forest. German artillery methodically reduced the trapped formations. Men who tried to break out ran into prepared positions. Surrender followed in waves.

Samsonov rode into the forest with his staff to observe the final breakout attempt. On the night of August 29, his aides heard a single shot. His body was found by German troops days later.

The Consequences

Tannenberg made Hindenburg a national hero and launched Ludendorff's career. Together they would dominate German strategy for the rest of the war — and Hindenburg's popularity would eventually make him President of the Weimar Republic, a position he used in 1933 to appoint Adolf Hitler as Chancellor.

For Russia, Tannenberg was a catastrophe that foreshadowed the army's eventual disintegration. The loss of 92,000 prisoners and fifteen divisions of equipment could not be easily replaced. Morale damage rippled through the entire force. Two weeks later, Rennenkampf's First Army was driven from East Prussia at the Battle of the Masurian Lakes.

The Eastern Front would not be won by either side in 1914. It would grind for three more years, consuming the Russian Empire, and producing the October Revolution that transformed the 20th century.

Tannenberg is remembered in Germany as a triumph. In Russia, it is almost too painful to remember at all.