Oh, light skirmishers are a different matter. They actually didn't have a 'formation' like heavier infantry. They didn't attack as a tightly packed unit, but as a cloud of individuals just doing their own thing, throwing missiles whenever they saw a target within range.
Closely packed heavier infantry needed to use discipline to avoid jostling and getting in each other's way - they needed to loose their missiles only on an officer's order, not whenever they felt like it.
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