I've been reading a book about the Spanish Armada. Interesting fact: the Spanish published every known figure about the fleet. They published the number of ships, guns, soldiers, pounds of food, everything they knew. Since the Armada was held in port by weather for weeks after publication, most of Europe knew the size of the fleet before the first shots were fired. English captains going to the battle carried a list of the enemy's plans.
The book makes it clear that the Armada would have lost anyway, since they had fewer ships, worse technology, bad sailors, and a tactical plan that relied on a miracle. Publishing the plans couldn't have been too big an influence, but Dios Mio, is that ever stupid.
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