Natural disasters

- Blizzards
- Contractible diseases
- Cyclones
- Earthquakes
- Famines
- Floods
- Landslides
- Heat waves
- Limnic eruptions
- Storms (non-cyclone)
- Tornadoes
- Tsunami
- Volcanic eruptions
- Wildfires and bushfires
- Monsters (godzilla, cloverfield) (perhaps modelled as side that is not defeated until all units destroyed [units set up to not require supply])

As there is no preventative action for most of these (except wildfires and diseases), the incidence can be set at the start of the game to prevent players restarting turns to avoid the disasters.