An army with the Purge the Foe Force Disposition facing one with Reconnaissance is dealt Consecrate as its primary mission.
The opposing army is not playing the same mission: it is dealt Triangulation. Reading only your own card is how a game gets lost from in front.
Purge-the-Foe against Reconnaissance. A friendly unit that destroys an enemy unit becomes a consecration unit; at the end of your turn each consecration unit may consecrate one unconsecrated non-home objective it is within range of, placing one of your operation markers within range. Scoring tiers on consecrated objectives at end of turn (one or two, OR three or more). From the second battle round, non-home control and the objective majority pay at the end of your Command phase. End of battle pays out if the opponent's home objective is consecrated.
Primary scoring is capped at 15 victory points in a battle round and 45 across the game.