diff --git a/android/assets/jsons/Civ V - Vanilla/Units.json b/android/assets/jsons/Civ V - Vanilla/Units.json
index 08c4697ed9..6ccecec7d4 100644
--- a/android/assets/jsons/Civ V - Vanilla/Units.json	
+++ b/android/assets/jsons/Civ V - Vanilla/Units.json	
@@ -310,6 +310,7 @@
 		"rangedStrength": 8,
 		"cost": 75,
 		"requiredTech": "Mathematics",
+		"requiredResource": "Iron",
 		"obsoleteTech": "Physics",
 		"upgradesTo": "Trebuchet",
 		"uniques": ["[+200]% Strength <vs cities> <when attacking>", "No defensive terrain bonus",
@@ -326,6 +327,7 @@
 		"strength": 8,
 		"rangedStrength": 10,
 		"cost": 75,
+		"requiredResource": "Iron",
 		"requiredTech": "Mathematics",
 		"obsoleteTech": "Physics",
 		"upgradesTo": "Trebuchet",
@@ -569,6 +571,7 @@
 		"rangedStrength": 14,
 		"cost": 120,
 		"requiredTech": "Physics",
+		"requiredResource": "Iron",
 		"obsoleteTech": "Chemistry",
 		"upgradesTo": "Cannon",
 		"uniques": ["[+200]% Strength <vs cities> <when attacking>","No defensive terrain bonus","Must set up to ranged attack","[-1] Sight","Never appears as a Barbarian unit"],