Today is the 258th anniversary of the battle of Kunersdorf, not Frederick the Great’s greatest moment. The king himself lost 3 horses, 1 shot from under him, and was saved from a musket ball by the snuff box in his coat pocket, after the battle he said:

It is a cruel failure that I will not survive. The consequences of the battle will be worse than the battle itself. I do not have any more resources, and—frankly confessed—I believe that everything is lost. I will not survive the doom of my fatherland. Farewell forever!

The battle itself is covered in far more detail than I can manage here and here, amongst other places.

As the date happens to fall on my birthday I treated myself to a small book: Die Schlacht von Kunersdorf by von Eberhardt from 1903, which contains some good sketches and a map of the battle.