The fourth campaign, the most disastrous of all the campaigns of this fearful war, had now opened. The Austrians filled Saxony and menaced Berlin. The Russians defeated the King's generals on the Oder, threatened Silesia, effected a junction with Laudohn, and entrenched themselves strongly at Kunersdorf. Frederic hastened to attack them. A great battle was fought. During the earlier part of the day everything yielded to the impetuosity of the Prussians, and to the skill of their chief. The lines were forced. Half the Russian guns were taken. The King sent off a courier to Berlin with two lines, announcing a complete victory. But in the meantime, the stubborn Russians, defeated yet unbroken, had taken up their stand in an almost impregnable position, on an eminence where the Jews of Frankfort were wont to bury their dead. Here the battle recommenced. The Prussian infantry, exhausted by six hours of hard fighting under a sun which equalled the tropical heat, were yet brought up repeatedly to the attack, but in vain. The King led three charges in person. Two horses were killed under him. The officers of his staff fell all round him. His coat was pierced by several bullets. All was in vain. His infantry was driven back with frightful slaughter. Terror began to spread fast from man to man. At that moment the fiery cavalry of Laudohn, still fresh, rushed on the wavering ranks. Then followed a universal rout. Frederic himself was on the point of falling into the hands of the conquerors, and was with difficulty saved by a gallant officer, who, at the head of a handful of Hussars, made good a diversion of a few minutes. Shattered in body, shattered in mind, the King reached that night a village which the Cossacks had plundered; and there, in a ruined and deserted farmhouse, flung himself on a heap of straw. He had sent to Berlin a second dispatch very different from his first: "Let the royal family leave Berlin. Send the archives to Potsdam. The town may make terms with the enemy."
The defeat was, in truth, overwhelming. Of fifty thousand men who had that morning marched under the black eagles, not three thousand remained together. The King bethought him again of his corrosive sublimate, and wrote to bid adieu to his friends, and to give directions as to the measures to be taken in the event of his death. "I have no resource left"--such is the language of one of his letters--"all is lost. I will not survive the ruin of my country. Farewell forever."