diff --git a/src/main/java/mops/gruppen2/entities/Gruppe.java b/src/main/java/mops/gruppen2/entities/Gruppe.java
index a88488f..74bda56 100644
--- a/src/main/java/mops/gruppen2/entities/Gruppe.java
+++ b/src/main/java/mops/gruppen2/entities/Gruppe.java
@@ -6,6 +6,7 @@ import mops.gruppen2.events.AddUser;
 import mops.gruppen2.events.CreateGroupEvent;
 import mops.gruppen2.events.UpdateGroupDescriptionEvent;
 import mops.gruppen2.events.UpdateGroupTitleEvent;
+import mops.gruppen2.events.DeleteUserEvent;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -43,5 +44,15 @@ public class Gruppe extends Aggregat {
 
 	public void applyEvent(UpdateGroupDescriptionEvent event) {
 		this.beschreibung = event.getBeschreibung();
+		this.teilnehmersList = new ArrayList<>();
+	}
+
+	public void applyEvent(DeleteUserEvent event) {
+		for (Teilnehmer teilnehmer: teilnehmersList) {
+			if (teilnehmer.getId().equals(event.getUser_id())) {
+				this.teilnehmersList.remove(teilnehmer);
+				break;
+			}
+		}
 	}
 }
diff --git a/src/main/java/mops/gruppen2/events/DeleteUserEvent.java b/src/main/java/mops/gruppen2/events/DeleteUserEvent.java
new file mode 100644
index 0000000..2b925a2
--- /dev/null
+++ b/src/main/java/mops/gruppen2/events/DeleteUserEvent.java
@@ -0,0 +1,11 @@
+package mops.gruppen2.events;
+
+import lombok.Getter;
+
+@Getter
+public class DeleteUserEvent extends Event{
+
+    public DeleteUserEvent(long id, long gruppe_id, long user_id) {
+        super(id, gruppe_id, user_id);
+    }
+}
diff --git a/src/main/java/mops/gruppen2/services/GruppenService.java b/src/main/java/mops/gruppen2/services/GruppenService.java
index d2a073c..0e60267 100644
--- a/src/main/java/mops/gruppen2/services/GruppenService.java
+++ b/src/main/java/mops/gruppen2/services/GruppenService.java
@@ -12,6 +12,18 @@ import java.util.List;
 @Service
 public class GruppenService {
 
+	CreateGroupEvent createGroupEvent = new CreateGroupEvent(1L,1L,1L,"hello", "foo");
+	AddUser addUser = new AddUser(1L, 1L, 1L, "jens","bendiest","jb@gmail.ru");
+	DeleteUserEvent deleteUserEvent = new DeleteUserEvent(1L, 1L, 1L);
+
+	public GruppenService(){
+		List<Event> eventList = new ArrayList<>();
+		eventList.add(createGroupEvent);
+		eventList.add(addUser);
+		eventList.add(deleteUserEvent);
+		Gruppe newGroup = buildGroup(eventList);
+	}
+
 	Gruppe buildGroup(List<Event> eventList){
 		Gruppe newGroup = new Gruppe();
 		eventList.forEach(newGroup::applyEvent);