Index: ps/trunk/binaries/data/mods/public/simulation/data/technologies/upgrade_rank_advanced_mercenary.json
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/data/technologies/upgrade_rank_advanced_mercenary.json
+++ ps/trunk/binaries/data/mods/public/simulation/data/technologies/upgrade_rank_advanced_mercenary.json
@@ -1,7 +1,7 @@
 {
 	"genericName": "Expertise In War",
 	"description": "Hire professional mercenaries to fight in your army.",
-	"cost": { "food": 200, "wood": 0, "stone": 0, "metal": 300 },
+	"cost": { "food": 0, "wood": 0, "stone": 0, "metal": 600 },
 	"requirements": {
 		"all": [
 			{ "tech": "phase_town" },