Pare what we know of ancient warfare down to primary sources, and it comes to a pamphlet.  With big borders.  Limit yourself to verifiable primary sources - if, for example, you get to wondering how the Peloponnesian Wars apparently exterminated half of the planet - and you've got a postcard.  And it's mostly address.

Of course, honesty doesn't give historians much to do, so there's a certain degree of... padding.

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Metus amatores matrum compescit, non clementia.