diff --git a/src/client/graphics/layers/EventsDisplay.ts b/src/client/graphics/layers/EventsDisplay.ts
index 12854d5a3..cbe8f334e 100644
--- a/src/client/graphics/layers/EventsDisplay.ts
+++ b/src/client/graphics/layers/EventsDisplay.ts
@@ -1,6 +1,6 @@
 import {nullable} from "zod";
 import {EventBus, GameEvent} from "../../../core/EventBus";
-import {AllianceRequest, AllianceRequestEvent, AllianceRequestReplyEvent, Game} from "../../../core/game/Game";
+import {AllianceRequest, AllianceRequestEvent, AllianceRequestReplyEvent, BrokeAllianceEvent as BrokenAllianceEvent, Game} from "../../../core/game/Game";
 import {ClientID} from "../../../core/Schemas";
 import {Layer} from "./Layer";
 
@@ -52,6 +52,7 @@ export class EventsDisplay implements Layer {
         this.eventBus.on(AllianceRequestEvent, a => this.onAllianceRequestEvent(a))
         this.eventBus.on(AllianceRequestReplyEvent, a => this.onAllianceRequestReplyEvent(a))
         this.eventBus.on(DisplayMessageEvent, e => this.onDisplayMessageEvent(e))
+        this.eventBus.on(BrokenAllianceEvent, e => this.onBrokenAllianceEvent(e))
         this.renderTable()
     }
 
@@ -147,6 +148,29 @@ export class EventsDisplay implements Layer {
         this.renderTable()
     }
 
+    onBrokenAllianceEvent(event: BrokenAllianceEvent) {
+        const myPlayer = this.game.playerByClientID(this.clientID)
+        if (myPlayer == null) {
+            return
+        }
+        if (event.traitor == myPlayer) {
+            this.addEvent({
+                description: `You broke your alliance with ${event.betrayed.name()}, making you a TRAITOR`,
+                type: MessageType.ERROR,
+                highlight: true,
+                createdAt: this.game.ticks(),
+            })
+        }
+        if (event.betrayed == myPlayer) {
+            this.addEvent({
+                description: `${event.traitor.name()}, broke their alliance with you`,
+                type: MessageType.ERROR,
+                highlight: true,
+                createdAt: this.game.ticks(),
+            })
+        }
+    }
+
     addEvent(event: Event): void {
         this.events.push(event);
     }
diff --git a/src/core/game/Game.ts b/src/core/game/Game.ts
index 0627216d7..4ab1b0f97 100644
--- a/src/core/game/Game.ts
+++ b/src/core/game/Game.ts
@@ -210,3 +210,7 @@ export class AllianceRequestEvent implements GameEvent {
 export class AllianceRequestReplyEvent implements GameEvent {
     constructor(public readonly allianceRequest: AllianceRequest, public readonly accepted: boolean) { }
 }
+
+export class BrokeAllianceEvent implements GameEvent {
+    constructor(public readonly traitor: Player, public readonly betrayed: Player) { }
+}
\ No newline at end of file
diff --git a/src/core/game/GameImpl.ts b/src/core/game/GameImpl.ts
index 7cb0a5565..f6ca227e5 100644
--- a/src/core/game/GameImpl.ts
+++ b/src/core/game/GameImpl.ts
@@ -1,7 +1,7 @@
 import {info} from "console";
 import {Config} from "../configuration/Config";
 import {EventBus} from "../EventBus";
-import {Cell, Execution, MutableGame, Game, MutablePlayer, PlayerEvent, PlayerID, PlayerInfo, Player, TerraNullius, Tile, TileEvent, Boat, BoatEvent, PlayerType, MutableAllianceRequest, AllianceRequestReplyEvent, AllianceRequestEvent} from "./Game";
+import {Cell, Execution, MutableGame, Game, MutablePlayer, PlayerEvent, PlayerID, PlayerInfo, Player, TerraNullius, Tile, TileEvent, Boat, BoatEvent, PlayerType, MutableAllianceRequest, AllianceRequestReplyEvent, AllianceRequestEvent, BrokeAllianceEvent} from "./Game";
 import {TerrainMap} from "./TerrainMapLoader";
 import {PlayerImpl} from "./PlayerImpl";
 import {TerraNulliusImpl} from "./TerraNulliusImpl";
@@ -335,7 +335,7 @@ export class GameImpl implements MutableGame {
             throw new Error('must have exactly one alliance')
         }
         this.alliances_ = this.alliances_.filter(a => a != alliances[0])
-        // TODO emit event.
+        this.eventBus.emit(new BrokeAllianceEvent(breaker, other))
     }
 
 }
\ No newline at end of file