When the legion gets to lower health e.g. 800 and your maximum possible attack strength is e.g. 250, then you could hit it three times, removing 250 health each time, but then the legion would be left with 50 health. It would be more efficient, in terms of RPs gained for resources used, to attack the legion four times with a strength of approximately 200.
Of course there is always the possibility that some other player will attack the legion and unintentionally spoil your plan.
There is a way to finish off a legion with low health (equal or less than 50) without wasting villager resources.
[[Category:Combat]]
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