Achilles was the son of a goddess and of a mortal; in that, he is the image of the genius of war. The divine part is all that that is derived from moral considerations of character, talent, the interest of your adversary, of opinion, of the temper of the soldier, which is strong and victorious, or feeble and beaten, according as he believes this divine part to be. The mortal part is the arms, the fortifications, the order of battle — everything which arises out of material things.
French military leader, French Emperor 1804–1814 and again in 1815 (1769–1821)
Napoléon Bonaparte (15 August 1769 – 5 May 1821) was a French military general who rose dramatically up the ranks of the French Army during the French Revolution, becoming the ruler of France as First Consul of the French Republic (11 November 1799 - 18 May 1804), and then Emperor of the French and King of Italy under the name Napoleon I (18 May 1804 - 6 April 1814, and again briefly from 20 March - 22 June 1815). He died in exile on the island of Saint Helena.
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From Wikidata (CC0)
A commander-in-chief cannot take as an excuse for his mistakes in warfare an order given by his sovereign or his minister, when the person giving the order is absent from the field of operations and is imperfectly aware or wholly unaware of the latest state of affairs. It follows that any commander-in-chief who undertakes to carry out a plan which he considers defective is at fault; he must put forward his reasons, insist on the plan being changed, and finally tender his resignation rather than be the instrument of his army's downfall.