Mercy is a noun, not a verb, so there is no past tense. You could say 'had mercy' which would be in the past tense.
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Mercy isn't a verb, so it doesn't have a past tense.
it´s not a verb so there is no past tense.
The past tense is marauded.
The past tense is battled.
The past tense of march is marched.