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The Second Prussian Army 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 centre. 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 Friedrich  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  centre 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  centre. 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 counter charges 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. High Casualties The battle ended with a high casualty rate for both sides. The  Prussians had nearly 9,000 men killed, wounded or missing.  The Austrians and allies had over 44,000 men killed, wounded  or missing, with 22,000 of these being prisoners. What made  the losses for the Austrians higher was that Austria had refused to sign the First Geneva Convention. Hence their 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.  Aftermath Königgrätz was the decisive battle of the Austro-Prussian War;  an armistice signed at Prague ensued three weeks later. It  provided a great opportunity for Prussian statesmen, by clearing a path toward German Unification, in particular with the Little  Germany or Germany without Austria solution, with the  subsequent foundation of the North German Confederation. The French public resented the Prussian victory and demanded  “Revanche pour Sadova” or “Revenge for Sadowa”, which  formed part of the build-up to the Franco-Prussian War of 1870.  Reproduced from Wikipedia
Below. Prussian Jagers.