“But it is almost impossible to communicate with them [one's spies in the enemy camp] and receive the information they possess ... Even when the general receives from his spies information of movements, he still knows nothing of those which may since have taken place, nor of what the enemy is going finally to attempt.”
Quote by Antoine-Henri Jomini
Author
Antoine-Henri Jomini
Antoine-Henri Jomini was a Swiss military theorist and writer, renowned for his seminal works on military strategy and tactics. Born on March 6, 1779, in the Valais region of Switzerland, Jomini served in the Swiss, French, and Russian armies during his career. His most famous works include 'The Art of War' and 'Vindications of the Conduct of the Campaigns of 1815'. He passed away on March 24, 1869. more
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Source: The Landmark Thucydides: A Comprehensive Guide to the Peloponnesian War
“With difficulty he is beaten who can estimate his own forces and those of his enemy.”
“Of all those in the army close to the commander, none is more intimate than the secret agent.”
“Of all rewards none [is] more liberal than those given to secret agents.”
“Set the troops to their tasks without imparting your designs.”
Source: The Art of War