diff --git a/public/games/age-of-dwarves/data/units/archer.json b/public/games/age-of-dwarves/data/units/archer.json
index 05ef3b07..b36ac594 100644
--- a/public/games/age-of-dwarves/data/units/archer.json
+++ b/public/games/age-of-dwarves/data/units/archer.json
@@ -18,6 +18,7 @@
     "cost": 50,
     "tech_required": null,
     "upgradeable_from": null,
+    "requires_resource": null,
     "race_required": null,
     "faction": null,
     "can_found_city": false,
diff --git a/public/games/age-of-dwarves/data/units/cavalry.json b/public/games/age-of-dwarves/data/units/cavalry.json
index 75fbda7b..0eb4fbb4 100644
--- a/public/games/age-of-dwarves/data/units/cavalry.json
+++ b/public/games/age-of-dwarves/data/units/cavalry.json
@@ -18,6 +18,7 @@
     "cost": 80,
     "tech_required": "animal_husbandry",
     "upgradeable_from": null,
+    "requires_resource": "iron_ore",
     "race_required": null,
     "faction": null,
     "can_found_city": false,
diff --git a/public/games/age-of-dwarves/data/units/spearmen.json b/public/games/age-of-dwarves/data/units/spearmen.json
index 66865223..3e788fd1 100644
--- a/public/games/age-of-dwarves/data/units/spearmen.json
+++ b/public/games/age-of-dwarves/data/units/spearmen.json
@@ -21,6 +21,7 @@
     "movement": 1,
     "vision": 2,
     "tech_required": "war",
+    "requires_resource": "iron_ore",
     "race_required": null,
     "faction": null,
     "keywords": ["reach"],