diff --git a/scripts/verify-battle-scenario-data.mjs b/scripts/verify-battle-scenario-data.mjs
index 0fa8ad3..8f29b85 100644
--- a/scripts/verify-battle-scenario-data.mjs
+++ b/scripts/verify-battle-scenario-data.mjs
@@ -43,6 +43,7 @@ try {
     assertNonEmptyString(errors, scenario.title, `${context}: title`);
     assertNonEmptyString(errors, scenario.victoryConditionLabel, `${context}: victory condition label`);
     assertNonEmptyString(errors, scenario.defeatConditionLabel, `${context}: defeat condition label`);
+    validateOpeningObjectiveLines(errors, scenario, context);
 
     validateMap(errors, scenario, terrainKeys, context);
     validateUnits(errors, scenario, classKeys, itemKeys, equipmentSlots, context);
@@ -67,7 +68,7 @@ try {
     );
     const tacticalGuideCount = scenarioEntries.reduce((total, [, scenario]) => total + (scenario.tacticalGuide ? 1 : 0), 0);
     console.log(
-      `Verified ${scenarioEntries.length} battle scenarios, ${unitCount} unit placements, maps, objectives, sortie data, ${tacticalGuideCount} tactical guides, equipment, and ${rewardCount} reward labels.`
+      `Verified ${scenarioEntries.length} battle scenarios, ${unitCount} unit placements, maps, opening briefs, objectives, sortie data, ${tacticalGuideCount} tactical guides, equipment, and ${rewardCount} reward labels.`
     );
   }
 } finally {
@@ -201,6 +202,17 @@ function validateObjectives(errors, scenario, context) {
   });
 }
 
+function validateOpeningObjectiveLines(errors, scenario, context) {
+  if (!Array.isArray(scenario.openingObjectiveLines) || scenario.openingObjectiveLines.length === 0) {
+    errors.push(`${context}: openingObjectiveLines must include at least one line`);
+    return;
+  }
+
+  scenario.openingObjectiveLines.forEach((line, index) => {
+    assertNonEmptyString(errors, line, `${context}: openingObjectiveLines[${index}]`);
+  });
+}
+
 function validateTacticalGuide(errors, scenario, eventKeys, context) {
   const guide = scenario.tacticalGuide;
   if (!guide) {