A recent editorial reminded me of the problems of estimating army sizes. Many ancient armies were not divided into neat units of uniform size, they did not have a central quartermaster’s service or staff which tracked numbers, and as Thucydides reminds us everyone lied about the strength of their own forces. Reporters who want to estimate the size of a demonstration face similar problems and rhetorical pressures (chose a high number to shock, or a low one to dismiss? Trust the police or the protestors? Base it on whether the crowd seemed larger or smaller than one whose size you ‘know’?) Like ancient historians, modern reporters don’t always give a source for their numbers, but when people ask them they tend to be frank:
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