The Germans only truly became a world power when they united under Chancellor Bismark. Before that, the most powerful of the German principalities was indeed Prussia, but Prussia was still not able to successfully conquer the other great European nations alone. They had to always rely on their many treaties with other countries such as Austria and Russia.
The funny thing about Napolean, time and again he was able to beat the Austrians, Prussians and Russians in battle. Yet the only two times he personally faced the English (Egypt and in Belgium) he went down to humiliating defeat. The Iberian Peninsular wars were of such minor consequence to him, he never got personally involved.
The Holy Roman Empire predated Bismarck.
Grouchy, the Prussian IV Corps, inclement weather helped the defeat.
Nelson did not really engage the French army. I cannot recall a battle with the English army in Egypt to Acre.
I have no excuses for the Russian invasion. What was he thinking.
I have been to his tomb in Paris, the captured flags are on display.