Previously destroyed units are added to the mission.

game/models/destroyed_units.py

@@ -0,0 +1,14 @@
+class DestroyedUnit:
+    """
+    Store info about a destroyed unit
+    """
+
+    x: int
+    y: int
+    name: str
+
+    def __init__(self, x , y, name):
+        self.x = x
+        self.y = y
+        self.name = name
+