--- ../work/decompile-bb26c12b/net/minecraft/server/VillageSiege.java	2014-11-27 08:59:46.921420877 +1100
+++ src/main/java/net/minecraft/server/VillageSiege.java	2014-11-27 08:42:10.100851012 +1100
@@ -140,7 +140,7 @@
             }
 
             entityzombie.setPositionRotation(vec3d.a, vec3d.b, vec3d.c, this.a.random.nextFloat() * 360.0F, 0.0F);
-            this.a.addEntity(entityzombie);
+            this.a.addEntity(entityzombie,  org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.VILLAGE_INVASION); // CraftBukkit
             BlockPosition blockposition = this.f.a();
 
             entityzombie.a(blockposition, this.f.b());