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The Battle of Königgrätz was the decisive battle of the Austro-Prussian War in which the Kingdom of Prussia defeated the Austrian Empire. Taking place near Königgrätz (Czech: Hradec Králové) and Sadowa (Sadová) in Bohemia on 3 July 1866, it was an example of battlefield concentration, a convergence of multiple units at the same location to trap and/or destroy an enemy force between them.
At the outset of the war in June, the Prussian armies were gathered along the Prussian border: the Army of the Elbe under Karl Herwarth von Bittenfeld at Torgau, the First Army under Prince Frederick Charles of Prussia between Senftenberg and Görlitz, and the Second Army under Crown Prince Frederick in Silesia west of Neiße (Nysa). The Austrian army under Ludwig von Benedek was concentrated at Olmütz (Olomouc). The campaign began with Herwath von Bittenfeld's advance to Dresden in the Kingdom of Saxony, where he easily defeated the Saxon army of 23,000 and joined with the First Army.
The reluctant Austrian commander Benedek had moved his troops out of their staging point at Olmütz only on 18 June, moving north in three parallel columns with the I Corps protecting the right flank. The Austrians took up positions at the fortress Josefstadt and the mountain passes from Saxony and Silesia.
On 22 June, Prussia's Chief of the General Staff, Helmuth von Moltke, ordered both armies under his command to Jitschin (Jičín) near the Austrian positions, a daring maneuver undertaken to limit the war's duration despite the risk of one army being overtaken en route.
However, Benedek was indecisive and failed to use his superior numbers to eliminate the Prussian armies individually. Initially, the Austrians were pressed back everywhere except at Trautenau (Trutnov), where they bested the Prussians despite great losses to their own forces. By 29 June, Prince Frederick Charles had reached Jitschin and inflicted a severe defeat on the Austrian I Corps under General Clam-Gallas. The Crown Prince had reached Königinhof (Dvůr Králové) despite stiff resistance.
On 30 June, Frederick Charles' First Army advanced to within one day's march of the Second Army. However, for the next two days the Prussian cavalry lost sight of the Austrians entirely, although Moltke's guess as to their actions—a retreat to the Elbe River—proved correct.
Eve of the battle
Dismayed by his losses, Benedek had ordered a withdrawal and urgently requested that Emperor Franz Josef make peace as the only way to save the army from a "catastrophe". When this was refused, and an ambiguous last sentence of the imperial telegram was interpreted as ordering a final stand, Benedek drew his Austrians up against the Elbe between Sadowa and Königgrätz.
The Prussians finally sighted the Austrians on the eve of 2 July near Sadowa, and Frederick Karl planned to attack the next morning. Moltke ordered the Crown Prince Frederick to join forces with the other two armies at the point where the Austrians were assembled, but the telegraph lines to the Second Army's positions were out, necessitating the dispatch of two mounted officers at midnight to ride the twenty miles' distance in time. They arrived at 4 a.m. The Crown Prince's Chief of Staff, Leonhard von Blumenthal, an able logistician, immediately reorganised Second Army's route plan.
The Austrian army of 215,000 faced the Prussian Army of the Elbe (39,000) and First Army (85,000) on 3 July. The Austrian infantry was partially fortified and supported by cavalry in the rear and artillery units with firing range across hilly, wooded terrain. The battle began at dawn in subsiding rain and mist as Prussia took its position west of the Bystřice River. Shortly before 8 a.m., the Austrian artillery opened fire, pinning down the Prussian right flank under Herwarth von Bittenfeld. The Saxons on the Austrian left fell back in good order, and proceeded to rain down fire on the advancing Prussian right from higher ground. Herwarth von Bittenfeld hesitated to order a full attack, and instead the advance guard of seven battalions, under Brig. General von Schöler pulled back to the river around 10:00 and took a defensive stance.
The Prussian center, with the Prussian 7th Division under General Edward Frederick Charles von Fransecky, having secured the Prussian rear earlier, led the advance into Swiep Forest, where it was met by two Austrian corps. The 7th Division had to both clear out the forest, and cover the Prussian left until the Second Army, under the crown prince, arrived. The Prussians methodically cleared the villages of Austrian defenders. King Wilhelm I of Prussia ordered the First Army across the river to support Fransecky. Sadowa was captured, but a fierce battle ensued in a nearby forest. The Austrian artillery held off the Prussians by firing into the smoke of the Prussian advance. The Prussians were slowed, and although the river was easy to wade, transporting artillery across it was extremely difficult. The Prussian attack was halted as the advancing Prussian 8th and 4th Divisions were cut down by the Austrian artillery as soon as they emerged from the smoke. However, the Austrian leader, Benedek, refused to call for a cavalry charge which later commentators have argued might have won the battle. Reserve units were deployed at noon, but the outcome of the battle was still uncertain and Prussian commanders anxiously waited for the crown prince.
To this point the Austrian superiority in numbers and position had held the day. Their weapons had longer range, which meant that the outnumbered Prussians could neither advance against the artillery barrage, nor effectively engage the Austrian infantry. The Prussians had attempted to bring three armies together for the battle, but problems with sending orders by telegraph and moving men by railroad had meant that only two of the three armies had arrived in time. The Prussian center, in the cover of the forest, was able to hold its position, and discourage a mounted charge by the Austrians, who were thought to have superior cavalry. However the close contact of the fight in the forest began to negate these advantages, the Austrians could not train their artillery on the close fighting, the damp weather made a cavalry charge risky, and Austrian IV Corps was committed piecemeal to the fighting. At this point the relative strengths of the two armies were beginning to reverse. The shorter range of the Prussian artillery as compared to the Austrian was moot, while the vastly higher rate of fire from the Prussian breech-loading needle gun, compared to the Austrian muzzle-loading small arms and cannon were paramount. In addition the needle gun could be operated while prone in defense, and while moving quickly on the advance, while the Austrians had to stand up after each shot to reload their Lorenz rifles.
At 11:00 came the deciding moment of the battle; the Austrian center began a maneuver to flank the Prussian 7th Division, which had pushed back and held off nearly a quarter of the Austrian army. Colonel Carl von Pöckh was sent to drive the Prussians back, and with a fierce infantry charge managed to force the 7th Division back to the outskirts of the forest. Benedek's corps commanders pleaded with him to launch a counterattack to destroy the Prussian First and Elbe armies before the Second army arrived, but Benedek declined to act, letting the opportune moment slip by. However, the tide of battle was about to turn, as flanking fire raked Pöckh's battalion, annihilating it as a fighting force and killing its commander. The fire came from the first elements of the crown prince's army as they arrived, and the 8th Division stiffened the Prussian center to hold off the Austrian thrusts. While divisions from the Austrian II and IV Corps were committed to the fighting, there was no decisive infantry charge, nor did the Prussians present a flank that could be attacked with cavalry. The Austrians were caught having moved from their defensive position to attack, and their right flank was exposed to the arriving Prussian infantry.
At 14:30 Crown Prince Frederick finally arrived with the main bulk of his almost 100,000 men, having marched with all possible haste all morning, and hit the Austrian right flank retiring from Swiep Forest while the Prussian artillery pounded the Austrian center. By 16:00 the last individual counter-attacks by the Austrian I and VI Corps were broken, even as Benedek ordered a withdrawal. Lt. General Frederick Hiller von Gärtringen's 1st Prussian Guard reached the Austrian artillery, forcing them to stop reforming an artillery line and pull back. He had attacked because he saw the artillery as holding together the Austrian position, and his attack destroyed the lone cavalry battery that stayed to fight, and forced the others to flee, along with their reserves.
At this point, having taken severe casualties, lacking artillery and cavalry cover, the high ground in enemy hands and the center being rolled up, the position for the Austrians deteriorated rapidly. The Second Prussian Army completely broke through the Austrian lines and took Chlum behind the center. The Army of the Elbe, which had merely held position after the early morning bloodying by the Austrian artillery and the Saxon infantry, attacked and broke through the Austrian left flank. It seized Probluz, and proceeded to destroy the Austrian flank. The Prussian king ordered all remaining forces into the attack all along the line, which had been slowed by the final counter-attack from the battalions of Brigadier General Ferdinand Rosenzweig von Dreuwehr's Austrian brigade. The arriving reinforcements joined the fight just as the Austrians had forced the 1st Prussian Guard back to Chlum. The result was a decisive shock of firepower which collapsed the Austrian line. The Prussian advance was so rapid that Benedek ordered a series of cavalry countercharges to back up his artillery and cover the general retreat he ordered at 15:00. These were successful at covering the Austrian rear, keeping the bridges over the Elbe open for retreating Austrian soldiers, and preventing pursuit by the Prussians, but at a terrible cost: 2,000 men and almost as many horses were killed, wounded or captured in the action. Benedek himself crossed the Elbe near 18:00 and several hours later informed the emperor that the catastrophe of which he had warned had indeed occurred.
The battle ended with heavy casualties for both sides. The Prussians had nearly 9,000 men killed, wounded or missing. The Austrians and allies had roughly 31,000 men killed, wounded or missing, with 9,291 of these being prisoners. Compounding the Austrians' losses was Austria's earlier refusal to sign the First Geneva Convention. As a result, Austrian medical personnel were regarded as combatants, and withdrew from the field with the main bulk of the forces, leaving the wounded to die on the field.
Königgrätz was the decisive battle of the Austro-Prussian War. Following the battle the Prussians continued to pursue the defeated Austrian Nord-Armee and fought a series of minor clashes with the last skirmish being fought at Blumenau on July 22 just as the Armistice to put a halt to the fighting was being signed. It provided a great opportunity for Prussian statesmen, by clearing a path toward German unification, in particular with the Little Germany (Germany without Austria) solution, with the subsequent foundation of the North German Confederation. The outcome also ensured that Prussia would have a free hand when the inevitable war with France came to pass in 1871.
It is known that even on 6 August 1866, I was in the position to observe the French ambassador make his appearance to see me in order, to put it succinctly, to present an ultimatum: to relinquish Mainz, or to expect an immediate declaration of war. Naturally I was not doubtful of the answer for a second. I answered him: "Good, then it's war!" He traveled to Paris with this answer. A few days after one in Paris thought differently, and I was given to understand that this instruction had been torn from Emperor Napoleon during an illness. The further attempts in relation to Luxemburg are known. 
The Königgrätzer Marsch was written to commemorate the battle.
- Kannoneer Jabůrek, probably the most famous ordinary Czech participant in the battle
- Königsberger Paukenhund, traditional kettle drum dog of the Prussian infantry, originating from this battle.
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- Austrian General Staff. "Verluste der Kiegsfuhrenden im Feldzuge 1866." KA, AFA. Kt. 2274, 1866-13-69. Vienna, June 10, 1871
- Hollyday 1970, p. 36.
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- Craig, Gordon A. (2003). The Battle of Königgrätz : Prussia's Victory Over Austria, 1866 (illustrated ed.). University of Pennsylvania Press. ISBN 978-0-8122-1844-2.
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- Gore-Brown, S (2009). The Prussian Artillery in the Campaign of 1866. Wokingham, Berkshire, UK: Helion & Co. Ltd. ISBN 978-1-906033-05-7.
- Hollyday, FBM (1970), Bismarck, Great Lives Observed, Prentice-Hall.
- Hozier, Henry (1867). The Seven Weeks' War. Vol. II. Whitefish, MT: Kessinger Pub. LLC. ISBN 0548164800.
- Perrett, Bryan (1992). The Battle Book. London, England: Arms and Armour Press. p. 237. ISBN 1-85409-328-2.
- Prussian General Staff, Department of Military History (2005). The Campaign of 1866 in Germany. Uckfield, East Sussex, UK: Naval & Military Press. ISBN 1-845741-81-1.
- Showalter, Dennis (2004). The Wars of German Unification. Modern Wars Series. London: Hodder Education. ISBN 978-0-340-58017-2.
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