What helped Napoleon successfully conquer many countries?

Napoleon Bonaparte was a talented ruler and strategist. His victorious campaigns were due to his ability to control the army and give orders. Also, the French emperor competently selected the leaders of the armed forces. His army numbered over 100 thousand soldiers. Thanks to hired soldiers from other states, their numbers increased. Countries subjected to French pressure were also affected by a frightening factor. Many surrendered without a fight in order to preserve the army and the image of the country.