An army with the Purge the Foe Force Disposition facing one with Priority Assets is dealt Destroyer's Wrath as its primary mission.
The opposing army is not playing the same mission: it is dealt Vital Link. Reading only your own card is how a game gets lost from in front.
Purge-the-Foe against Priority-Assets. Destroying any enemy unit pays at end of turn. From the second battle round, the Command-phase check pays for non-home control and pays well for the objective majority, while end of turn pays for out-killing the opponent (more enemy units destroyed this turn than friendly units lost last turn).
Primary scoring is capped at 15 victory points in a battle round and 45 across the game.