The violence of the enemy's at first threatened to turn our position and drive us from the field, but we quickly regrouped and a stunning defeat on the foe.

a.) onslaught, inflicted
b.) wrath, eroded
c.) remnant, consolidated

In short it's A). onslaughtinflicted                                                                                                                                            The violence of the enemy's ''onslaught''  at first threatened to turn our position and drive us from the field, but we quickly regrouped and inflicted a stunning defeat on the foe.                                                                      

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~courtney