An army with the Priority Assets Force Disposition facing one with Purge the Foe is dealt Vital Link as its primary mission.
The opposing army is not playing the same mission: it is dealt Destroyer's Wrath. Reading only your own card is how a game gets lost from in front.
Priority-Assets against Purge-the-Foe. The Maintain Control action (Shooting phase, a friendly unit within range of a central objective, once per turn, completes at end of turn if the unit controls that objective) places one of your operation markers within range of that objective. Central control pays at end of turn with a stacking bonus per marker within range of a controlled central objective. From the second battle round, the Command-phase check pays for non-home control with a stacked bonus when one of those is a central objective. End of battle pays a large bonus for holding the opponent's home objective.
Primary scoring is capped at 15 victory points in a battle round and 45 across the game.