
Originally Posted by
Callicles
Moreover, if you are concerned about being flanked, the conventional wisdom is to shorten your line and increase your depth. Putting your army in three lines rather than one has this same effect.
Generally, I think about depth more than length. Maybe I'm wrong in that regard. It seems that infantry is more capable of withstanding a charge if they have more mass (that is, more depth). But if the line is thin (only 3 or 4 men deep), then the enemy can easily punch through, disorganize the line, and cause a mass route rolling up the remainder of the line.
Of course, for the contrary position, see the Battle of Cannae; Hannibal had a pretty thin line there, and the Romans were very deep.
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