Nasdara - the following events in db/events.xml all contain, what I assume is accidental, the inclusion of a secondary event type InfectedArmy . This is not seen the same event type in any of the other maps:

• AnimalGoat

• AnimalMouflon

• AnimalWildBoar

• ItemBricks

• VehicleOffroad02

• VehicleTruck01

Upshot seems that anywhere one of these event spawns a group of military zombies spawns too:

19:50:19 [04] AnimalGoat
19:50:19   Primary Spawner: "Animal", active: yes, repeat: 1
19:50:19   Secondary Spawner: "Infected", active: yes, repeat: 1
19:50:19 [05] AnimalMouflon
19:50:19   Primary Spawner: "Animal", active: yes, repeat: 1
19:50:19   Secondary Spawner: "Infected", active: yes, repeat: 1
19:50:19 [07] AnimalWildBoar
19:50:19   Primary Spawner: "Animal", active: yes, repeat: 1
19:50:19   Secondary Spawner: "Infected", active: yes, repeat: 1
19:50:19 [21] ItemBricks
19:50:19   Primary Spawner: "Item", active: yes, repeat: 1
19:50:19   Secondary Spawner: "Infected", active: yes, repeat: 1

Start server, look at RPT logs, check for secondary spawner for the event.

Events don't try to spawn a secondary event.