I want to know the answer to the following question:
Who said that Napoleon's presence on the battlefield was worth 40,000 soldiers?
All the background I'm provided with is that "At the Battle of Auerstadt in 1806, King Frederick William III of Prussia outnumbered the French by 63,000 to 27,000; however, when he mistakenly was told that Napoleon was in command, he ordered a hasty retreat that turned into a rout.". Is that enough to answer the question?