[9]
The advance of cavalry is less likely to be detected by the enemy if orders are not given by a herald or in writing beforehand, but passed along. Accordingly, for this purpose, too, that the order to advance may be given by word of mouth, it is well to post fileleaders, and half file-leaders1 behind them, so that each may pass the word to as few men as possible. Thus, too, the half file-leaders will wheel and extend the line without confusion, whenever there is occasion to do so.
1 These form the sixth rank.
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