The use of intelligence varied greatly across the major world powers of the war. Napoleon at this time had more supply of intelligence given to him than any French general before him. However, Napoleon was not advocate of military intelligence at this time as he often found it unreliable and inaccurate when compared to his own preconceived notions of the enemy. Napoleon rather studied his enemy via domestic newspapers, diplomatic publications, maps, and prior documents of military engagements in the theaters of war in which he would operate. It was this stout and constant study of the enemy which made Napoleon the military mastermind of his time. Whereas, his opponents—Britain, Austria, Prussia, and Russia—who were much more reliant on traditional intelligence gathering methods and were much more quickly and willing to act on them.