Battle of Tannenberg

For the 1410 battle at the same location, see Battle of Grunwald.

Battle of Tannenberg
Part of the Eastern Front of World War I
Date 23 August-2 September 1914 Location near Allenstein, East Prussia Result Decisive German Victory
Belligerents
Russian Empire	German Empire
Commanders and leaders
Alexander Samsonov † Pavel von Rennenkampf	Paul von Hindenburg Erich Ludendorff
Strength
I Army (210,000) II Army (190,000)	VIII Army (150,000)
Casualties and losses
60,000 killed or wounded; 95,000 captured	20,000 killed or wounded

The Battle of Tannenberg was a decisive engagement between the Russian Empire and the German Empire in the first days of World War I, fought by the Russian First and Second Armies and the German Eighth Army between 23 August and 2 September 1914. The battle resulted in the almost complete destruction of the Russian Second Army. A series of follow-up battles destroyed the majority of the First Army as well, and kept the Russians off-balance until the spring of 1915. The battle is notable particularly for a number of rapid movements of complete corps by train, allowing the single German Army to present a single front to both Russian Armies.

Although the battle took place near Allenstein, it was named after Tannenberg by the Germans to signify a reversal of the medieval Battle of Tannenberg (or Grunwald).

Background

The Allied battle plan prior to the War had been based on France and the United Kingdom simply halting the German Armies in the west while the huge Russian Armies could be organized and brought to the front. The numbers were overwhelming; in perhaps as little as a month, the Russians could field around ten complete armies, more men than the German Army could muster on both fronts put together.

Frustrating this plan was the Russians' lack of a quality railroad network—theirs operated on a different gauge than the German railroad network, meaning that unless the Russians acquired German railroad cars, most of their armies could only be brought to the German border. The presence of the armies of Austria-Hungary to the south as well as initially those of Japan to the east limited Russia's involvement in the beginning. Nevertheless, the Russians considered the Germans to be their primary threat, and had organized a plan to use limited forces to quickly seize East Prussia.

The Germans likewise, considered the Russians to be their primary threat. The entire Schlieffen Plan was based on the idea of defeating France and Britain as quickly as possible, and then transporting their armies by train to the eastern front. This allowed the Germans to garrison Prussia fairly lightly, with a single army, the Eighth. That said, there was little allowance for anything other than a spoiling retreat while the outcome in the west was decided. In order to delay the Russian forces as long as possible, the entire area around Königsberg, near the Russian border, was heavily fortified with a long series of fieldworks.

Just prior to the opening of the war the situation developed largely as pre-war planning had expected. The German Eighth Army was in place southwest of Königsberg, while the two available Russian armies were located to the east and south, the latter in what was known as the "Polish Salient". Russian battle plans called for an immediate advance by the First Army under General Pavel Karlovich von Rennenkampf into East Prussia, with Königsberg as their short-term goal. The Russian Second Army under General Alexander Samsonov, located to the south, was to move westward around the Masurian Lakes and then swing north over a hilly area to cut off the Germans, who would by this point be forced into defending the area around Königsberg. If executed successfully, the Germans would be surrounded.

Prelude

When the war opened, the battle initially went largely according to the Russians' plan. The Germans had moved up about half of the units of the Eighth Army, re-enforced by small groups of the Königsberg garrison, to points to the east of Königsberg near the border. The Battle of Stallupönen, a small engagement by the German I Corps under Hermann von François was initially successful. The German theater commander, General Maximilian von Prittwitz, nevertheless ordered a spoiling retreat towards Gumbinnen. A counterattack planned for 20 August had a fair chance of succeeding but François, apparently emboldened by his success at Stalluponen, attacked early and ruined the chance for surprise. The Battle of Gumbinnen ended with the Germans forced to retreat, in many cases via rail, to positions to the south of Königsberg.

Worried about his loss at Gumbinnen and the continued advance of the Russian Second to the south, Prittwitz ordered a retreat to the Vistula, effectively abandoning eastern Prussia. When he heard this, Helmuth von Moltke, the German Army Chief of Staff, recalled Prittwitz and his deputy Waldersee to Berlin. They were replaced by Paul von Hindenburg, called out of retirement, with Erich Ludendorff as his Chief of Staff.

Things were not quite as dire as they seemed to the German commanders in Berlin. The two Russian commanders, Samsonov and Rennenkampf, hated each other after Samsonov had publicly complained about Rennenkampf's behavior at the Battle of Mukden in 1905. Although the common belief that the two generals had come to blows at a railway station has proved to be incorrect (Showalter, 1991, p.134), Rennenkampf would be disinclined to help Samsonov except under dire circumstances. Meanwhile, Samsonov's Second Army was having serious problems moving forward due to fragile supply lines to the rear, and unknown even to Samsonov, Rennenkampf had decided to delay the First's advance to regroup after Gumbinnen, believing the Germans were preparing another attack.

Nevertheless, the scale of the forces deployed still meant the Russians had the upper hand. As they were currently deployed, the Eighth Army could not even cover the entire front along Samsonov's line of march, leaving Samsonov's left wing in the southwest open to advance with no opposition. Unless troops from the Königsberg area, currently the I and XVII Corps, could be moved to check this advance, the Germans were in serious danger of being cut off.

Planning

Colonel Max Hoffmann, Prittwitz's deputy chief of operations, was well aware of the bad blood between the two Russian generals, and what it was likely to mean for the two armies' plan of action. Guessing that they would remain separated, as they were at the time, he proposed moving everyone not already in Königsberg's eastern defense line to the southwest, moving the I Corps by train to the left of Samsonov's line, a distance of over 100 miles. The XVII Corps, south of the I, would be readied for a move directly south to face Samsonov's right flank, the VI Corps. Additionally the small cavalry forces nearby would move to the Vistula River area to the west. It appears he hoped the cavalry would draw Samsonov westward, further separating the armies. This left only a small portion of the Königsberg area directly in front of the First Army defended, while the approaches from the south were entirely open.

In theory, the plan was extremely risky. If the First Army turned to the southwest instead of advancing directly westward towards Königsberg, they would appear on the Eight Army's extreme left flank, allowing for either a counterattack against the Eighth, or alternately turn north towards Königsberg from the south, which was now undefended. However, Hoffmann remained convinced of the plan, both because he was aware of the animosity between the generals, as well as the fact that the Russians continually sent out their next day's marching orders over unencrypted radio communications. It appears they believed that the Germans would not have access to Russian translators (see note below), but the Germans easily intercepted and translated the transmissions.

When Hindenburg and Ludendorff arrived on 23 August, they immediately stopped the retreat and put Hoffmann's plan into action. Since Prittwitz had already ordered the German troops to pull back via train, Ludendorff sent out new orders telling the 1st to detrain near Deutsch-Eylau in order to move up and cover the left flank of the XX Corp, who had been in place in front of the Second Army from before the battle at Gumbinnen. Hoffmann had already issued similar orders, so little confusion resulted. Ludendorff did, however, leave the cavalry where they were, forming a screening force in front of the Russian First's left flank. Hindenburg's remaining two corps, under Mackensen and Below, were to await orders to move south by foot so as to confront Samsonov's right wing. Finally, a fourth garrison corps, the I Reserve Corps, was ordered to remain near the Vistula to meet Samsonov as his army moved north. The trap was being set.

Ludendorff also learned at this point that Moltke had also decided to take three Corps and a cavalry division from the western front and redeploy them to the East. Ludendorff protested that they would arrive too late to have any effect, while at the same time weakening the battle against France. Moltke considered East Prussia too politically important to lose, and ignored Ludendorff's protests.

Opening moves

Movements of 23 August-26 August 1914

Starting on 22 August, Samsonov's forces had met the Germans all along his front, and had successfully pushed them back in several places. On the 23rd they managed to push the German XX Corps back, and the XX retreated to the Orlau-Frankenau line that night. The Russians followed, and on the 24th they met them again at the minor Battle of Orlau-Frankenau, where the now-entrenched XX stopped the Russian advance. Once again the XX retreated in order to prevent a possible encirclement by superior forces. Undeterred, Samsonov saw this as a wonderful opportunity to cut this unit off completely, because, as far as he was aware, both of his flanks were unopposed. He ordered most of his units to the northwest, towards the Vistula, leaving only the VI Corps to continue towards their original objective, Seeburg or Sensberg.

Concerned about this possible flanking maneuver, Ludendorff issued an order to François' now-deployed I Corps to initiate the attack on Samsonov's left wing at Usdau on 25 August. François rejected this direct order, stating there was no way to have the corps ready in time and that he wanted to wait until his artillery support was ready on 27 August. Ludendorff and Hoffmann would have none of this, and traveled to meet François to repeat the order to his face. François agreed to commence the attack, but complained of a lack of shells.

On the way back from the meeting, Hoffmann received new intercepts from the Russian radio; having run short of wire and laying gear, the Russian generals had no choice but to use it. Rennenkampf's marching orders stated the next day's offensive would continue due west, ignoring Samsonov, just as Hoffmann had hoped. No matter the outcome of the next few day's battle, the Russian First Army would not be a serious concern. A second intercept of Samsonov's own plans made it clear that he would continue his own march northwest, having concluded that the Germans would continue to retreat in front of Tannenberg.

Ludendorff and Hindenburg were skeptical that the intercepts were real, finding it hard to believe even one commander would send his communications in the clear, let alone two Nevertheless they were eventually convinced they were indeed real, and the plans were put into action. I Corps would open its attack on the Russian left flank on 25 August, while orders were sent to XVII Corps to move south and meet the Russian right flank as soon as possible.

Given the need for immediate action was no longer pressing, François once again demanded he be allowed to wait for his artillery supplies. Ludendorff and François began arguing, and eventually François delayed enough to allow the battle to open on 27 August as he had wished.

The battle

The morning of the 26th opened with the Russian First Army advancing westward, meeting little resistance. The troops that were formerly directly in front of them had moved to the south, facing the Second Army's right flank. There was still time to close the gap between the armies and thereby threaten the German movements, which by this point were being reported back to Russian headquarters. Nevertheless, on the night of the 25th, the Russian field commander sent orders for the First to continue directly west to Königsberg, orders that were once again intercepted.

Due to François' delays, it was the German XVII Corps that opened the battle proper. They met the two separated divisions of the Russian VI Corps near Seeburg and Bischofstein, turning them both back toward the border in disarray. The right flank of the Russian Second Army was now open. In the meantime, the Russian advance toward Tannenberg continued to be blocked by the XX Corps in front of them. Their only successes were in the middle, where their XIII Corps advanced towards Allenstein unopposed.

François opened his own attack on the Russian left on the 27th, held by the Russian's own I Corps. His artillery proved to be decisive, and by the night the Russians were falling back. In order to help stabilize the line, Samsonov ordered the seemingly successful XIII Corps to abandon Allenstein and turn southwest to help break through at Tannenberg. By the time this maneuver was complete, the bulk of the Russian Second Army were all in the Tannenberg area, consisting of the newly-arrived XIII, the XV and parts of the XXIII.

Movements of 27 August-30 August 1914

By the evening of 28 August the full extent of the potential danger to the Russians was evident. The I Corps on the left and the VI Corps on the right were both retreating. Meanwhile the center was having serious supply problems and could no longer hope to maintain an offensive. Samsonov had no option but to order a retreat to re-form the lines to their southeast near the border. Meanwhile he asked Rennenkampf to ignore Königsberg and turn southwest to help.

But it was too late. François by this time had advanced due east to form a line to the south of the Russians between Niedenburg and Willenburg, directly in front of their retreat. At the same time, the XVII Corps in the north had moved southwest to meet him. The next day the Russian center met these troops on their way to regroup, and realized they were surrounded. A pocket formed east of Tannenberg, near Frogenau, and was pounded throughout 29 August.

Attempts by the Russian First Army to come to their aid were also far too late to help. The cavalry screen proved effective at delaying them, and by the time the battle was already over their closest unit was still to the northwest of the initial contact between the German XVII Corps and Russian VI Corps, perhaps as much as 45 miles (70 km) from the now developed pocket. Other units were scattered back along the line to Königsberg, leaving the First itself in a dangerously spread-out position.

By the time the battle ended on 30 August, 95,000 Russians troops were captured, another 30,000 killed or wounded, and only 10,000, mostly from the retreating flanks, managed to escape. The Second Army no longer existed. The Germans suffered fewer than 20,000 casualties and captured over 500 guns. Sixty trains were required to transport captured equipment to Germany.

Rather than report the loss of his army to the Czar, Samsonov committed suicide by shooting himself in the head on 29 August 1914.

After the battle

The German-built monument, which later served as the place of interrment for Paul Hindenburg, was demolished after World War II. This 1998 photo shows the remains of the foundations.

The German Eighth Army now faced only the Russian First. In a series of follow-up battles, notably the First Battle of the Masurian Lakes, the First was almost completely destroyed, and turned back over their borders. A Russian Army would not march on German soil again until the end of World War II.

Hindenburg and Ludendorff were both hailed as heroes, although Hoffmann was generally ignored in the press. Apparently not amused by Hindenburg's role, Hoffmann later gave tours of the area noting "this is where the Field Marshal slept before the battle, this is where he slept after the battle, and this is where he slept during the battle." However, Hindenburg is quoted as saying "If the battle had gone badly, the name 'Hindenburg' would have been reviled from one end of Germany to the other."

Ludendorff sent the official dispatch from Tannenberg, and the battle was named Battle of Tannenberg at the direct request of Hindenburg. Hindenburg chose Tannenberg because of its historical significance; it is the location where the Teutonic Knights were defeated by the Slavic forces at the Battle of Grunwald (referred to in German as Schlacht bei Tannenberg - i.e the Battle of Tannenberg). Interestingly, an ancestor of Hindenburg's had fallen at the battle in 1410.

One interesting side-effect of the battle has since become an arguing point among historians. The three corps, one complete army, that Moltke had sent to bolster the east never arrived in time to have any effect. However, over a week was lost due to this confusion. Some have suggested that the removal of an army in the west in the midst of battle was a reason the Schlieffen Plan failed. If this is true, it could mean that Tannenberg was possibly the successful battle that ultimately lost the war for Germany.

The battle is at the center of Aleksandr Solzhenitsyn's novel August 1914. This novel is recomendable as great literature, evidently modeled on Tolstoy's acclaimed masterpiece "War and Peace" which features the Battles of Austerlitz and Borodino.

A German monument was completed in 1927. However, it was destroyed by the Soviets and Poles after World War II. Some of its stones were used to build the current Grunwald monument at the site of the 1410 battle.

Ludendorff would later revisit the battle when naming his own political movement, the Tannenbergbund, formed in 1925.

Bibliographic References

• Showalter, Dennis (1991), Tannenberg: Clash of Empires, Hamden, CT: Archon Books, ISBN 978-0208022523.

• Tuchman, Barbara (1962), The Guns of August (First Ballantine Books edition ed.), New York, NY: Ballantine Books, ISBN 0-345-38623-X {{citation}}: |edition= has extra text (help).
• Tannenberg 1914 by John Sweetman. Includes battle plans in colour and archived black and white photographic plates of the battle.

See also

• Order of battle at Tannenberg (1914)

External links

• Battle of Tannenberg