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| 1914 | Battle of Orlau Frankenau |  |
| 24th Aug Orlau Frankenau Attacks East Prussia & defeats the Germans |
| 24th Aug Orlau Frankenau bu the Germans know Russian positions because they decode radio messages |
| 24th Aug Orlau Frankenau Russia withdraws to Tannenberg |
| 24th Aug Orlau Frankenau The Germans know the Russian positions because of Samsonov's uncoded radio messages |
| 24th Aug Orlau Frankenau The Russians are stopped by the German XX corps |
| 24th Aug Orlau Frankenau Withdraws to Tannenberg |
| 25th Aug Orlau Frankenau The Germans advance to Tannenburg to trap the Russian Army |
| 1914 | Battle of Tannenburg |  |
| 20th Aug Tannenburg Samsonov runs into a German trap, 1st day of the battle of Tannenburg |
| 22nd Aug Tannenburg Invades Germany near the village of Tannenberg |
| 24th Aug Tannenburg Zhilinsky orders Samsonov to stop "acting the coward & resume the offensive" |
| 26th Aug Tannenburg 2 Russian corps, 13th, 15th & 23rd are trapped |
| 26th Aug Tannenburg Decisive German victory under Hindenburg & Ludendorf against Russia in East Prussia |
| 26th Aug Tannenburg Shoots himself after the Battle of Tannenburg |
| 26th Aug Tannenburg The Russian centre moves into a trap & is overwhelmed by the German VIII Army |
| 27th Aug Hohenstein Hindenburg drives Samsonov's army back to Hohenstein |
| 27th Aug Tannenburg Hindenburg takes 90,000 prisoners & several hundred guns |
| 27th Aug Tannenburg Only 60,000 Russian troops escape |
| 27th Aug Tannenburg Samsonov is surrounded on 3 sides by Hindenburg's army & by swamps & lakes |
| 28th Aug Tannenburg The Russian 2nd Army disintegrates, Samsonov shoots himself |
| 29th Aug Tannenburg Samsonov has lost 2 corps & the remaining 3 are reduced to 1/2 size |
| 29th Aug Tannenburg The Russians are routed & Samsonov shoots himself |
| 1914 | Death |  |
| 9th Aug Tannenburg Shoots himself after the Battle of Tannenburg |
| 1914 | Invasion of Germany |  |
| 20th Aug Samsonov's 2nd Army starts to advance into East Prussia |
| 22nd Aug Tannenburg Invades Germany near the village of Tannenberg |
| 1914 | Invasion of Prussia |  |
| 17th Aug Prussia Leads the 2nd Army, 13 divisions & 5 corps, in the ill-fated invasion of Prussia |