diff --git a/android/assets/jsons/Techs.json b/android/assets/jsons/Techs.json
index aa358f2106..0624b6bf9b 100644
--- a/android/assets/jsons/Techs.json
+++ b/android/assets/jsons/Techs.json
@@ -13,6 +13,10 @@
 				name:"Animal Husbandry",
 				row:5
 			},
+			{
+				name:"Archery",
+				row:5
+			},
 			{
 				name:"Mining",
 				row:9
@@ -51,7 +55,7 @@
 			{
 				name:"The Wheel",
 				row:6,
-				prerequisites:["Animal Husbandry"]
+				prerequisites:["Animal Husbandry", "Archery"]
 			},
 			{
 				name:"Masonry",
@@ -92,7 +96,7 @@
 			{
 				name:"Construction",
 				row:9,
-				prerequisites:["Masonry"]
+				prerequisites:["Masonry","The Wheel"]
 			}
 		]	
 	},
@@ -141,7 +145,7 @@
 			{
 				name:"Civil Service",
 				row:4,
-				prerequisites:["Horseback Riding","Philosophy"]
+				prerequisites:["Currency","Horseback Riding","Philosophy"]
 			},
 			{
 				name:"Physics",
@@ -151,7 +155,7 @@
 			{
 				name:"Metal Casting",
 				row:10,
-				prerequisites:["Construction","Iron Working"]
+				prerequisites:["Engineering","Iron Working"]
 			}
 		]
 	},
diff --git a/android/assets/jsons/Units.json b/android/assets/jsons/Units.json
index 277bb32893..6fe16429ea 100644
--- a/android/assets/jsons/Units.json
+++ b/android/assets/jsons/Units.json
@@ -45,6 +45,7 @@
 		rangedStrength:7,
 		cost: 40,
 		hurryCostModifier:20
+		requiredTech:"Archery",
 		obsoleteTech:"Machinery",
 		upgradesTo:"Crossbowman"
 	},
@@ -129,6 +130,8 @@
 		rangedStrength:14,
 		cost: 120,
 		requiredTech:"Physics",
+		obsoleteTech:"Chemistry",
+		upgradesTo:"Cannon",
 		uniques:["Bonus vs City 200%","No defensive terrain bonus","Must set up to ranged attack","Limited Visibility"],
 		hurryCostModifier:20
 	},
@@ -164,6 +167,31 @@
 		hurryCostModifier:20
 	},
 	
+	// Rennaisance Era
+
+/*	
+	{
+		name:"Cannon",
+		unitType:"Siege",
+		movement:2,
+		strength:14,
+		rangedStrength:20,
+		cost: 185,
+		requiredTech:"Chemistry",
+		uniques:["Bonus vs City 200%","No defensive terrain bonus","Must set up to ranged attack","Limited Visibility"],
+		hurryCostModifier:20
+	},
+	{
+		name:"Musketman",
+		unitType:"Melee",
+		movement:2,
+		strength:24,
+		cost: 150,
+		requiredTech:"Gunpowder",
+		hurryCostModifier:20
+	},
+	*/
+	
 	/* Great people */
 	
 	{