All trades are now cancelled when a civ is defeated

android/assets/jsons/Translations.json

@@ -4808,6 +4808,8 @@
 		German:"[civName] hat uns den Krieg erklärt!"
 	}
 	
+	"[tradeOffer] from [otherCivName] has ended":{}
+	
 	"[leaderName] of [nation]":{ // e.g. Ramasses of Egypt, Napoleon of France
 		Italian:"[leaderName] dell'Impero [nation]" //es. Ramses II dell'Impero egiziano, Napoleone dell'Impero francese (so it should be [adjective] instead of [nation]
 		German:"[leaderName] von [nation]"

core/src/com/unciv/logic/battle/Battle.kt

@@ -196,9 +196,7 @@ class Battle(val gameInfo:GameInfo) {
         if(city.cityConstructions.isBuilt("Palace")){
             city.cityConstructions.removeBuilding("Palace")
             if(enemyCiv.isDefeated()) {
-                for(civ in gameInfo.civilizations)
+                enemyCiv.destroy()
-                    civ.addNotification("The civilization of [${enemyCiv.civName}] has been destroyed!", null, Color.RED)
-                enemyCiv.getCivUnits().forEach { it.destroy() }
                 attacker.getCivInfo().popupAlerts.add(PopupAlert(AlertType.Defeated,enemyCiv.civName))
             }
             else if(enemyCiv.cities.isNotEmpty()){

core/src/com/unciv/logic/civilization/CivilizationInfo.kt

@@ -508,5 +508,18 @@ class CivilizationInfo {
         }
     }
 
+    fun destroy(){
+        for(civ in gameInfo.civilizations)
+            civ.addNotification("The civilization of [$civName] has been destroyed!", null, Color.RED)
+        getCivUnits().forEach { it.destroy() }
+        tradeRequests.clear() // if we don't do this then there could be resources taken by "pending" trades forever
+        for(diplomacyManager in diplomacy.values){
+            diplomacyManager.trades.clear()
+            diplomacyManager.otherCiv().getDiplomacyManager(this).trades.clear()
+            for(tradeRequest in diplomacyManager.otherCiv().tradeRequests.filter { it.requestingCiv==civName })
+                diplomacyManager.otherCiv().tradeRequests.remove(tradeRequest) // it  would be really weird to get a trade request from a dead civ
+        }
+    }
+
     //endregion
 }