Days of Wrath

The Days of Wrath (also known as Armageddon) was a series of Solar Alliance-targeted attacks against the Pact of Totalism via superweapons in occupied territories across Earth, the Pony World and the Solar System. The decision to use weapons of mass destruction was a difficult one for Wangombe Kenyatta and his military advisers, since all of them had family outside of the newly-greened Antarctica. However, it was the only way to deny the Children of the Stars and the Shroobs any more human and pony military technology and resources.

The world of Harmony Strike lies in ruins as a result of this catastrophic event. The great war is an integral part of the Harmony Strike series canon, as it's the major event that predates the events of both the books and the games.

Aftermath
Almost all of the elite and the super-rich, including polticians, scientists, military personnel, security personnel, safety personnel, rescue personnel, medical personnel, meteorologists, broadcasters, religious leaders, and mostly women and children of lower class, working class and middle class, including some lucky men (from Earth, the Solar System and the Pony World, all in all), altogether managed to survive the last-resort tactic on a grand, apocalyptic scale.

By using chemical weapons, biological weapons, nuclear weapons, orbital lasers and many other superweapons, whenever they're legal or illegal, both worlds, including most of the Solar System's planets are all but uninhabitable.

Soon after, there was a global societal disruption, including the collapse of existing nation states, severe damage to the environment, accelerated global warming (following a nuclear winter; including harsher winters), widespread radioactive pollution leads to the emergence of mutations, etc.

Other than that, the POT denied of all military and technological assets with a cost of destruction to most Earth and Pony World nations, including Solar System colonies. With firestorms finally extinguished by the cold wind of a year-long winter, the Deadlands are formed, and thusly, the Surrounded are formed.

Earth

 * Astrakhan, Astrakhan Oblast, Russia
 * Balashikha, Moscow Oblast, Russia
 * Berlin, Germany
 * Boston, Massachusetts, United States
 * Chicago, Illinois, United States
 * Częstochowa, Silesian Voivodeship, Poland
 * Gdańsk, Pomeranian Voivodeship, Poland
 * Gdynia, Pomeranian Voivodeship, Poland
 * Irkutsk, Irkutsk Oblast, Russia
 * Kazan, Tatarstan, Russia
 * Kiev, Ukraine
 * Kraków, Lesser Poland Voivodeship, Poland
 * Las Vegas, Nevada, United States
 * Łódź, Łódź Voivodeship, Poland
 * Manila, Metro Manila, Philippines
 * Minsk, Belarus
 * Mirny, Antarctica, Russia
 * Mirny, Sakha Republic, Russia
 * Moscow, Moscow Oblast, Russia
 * Novosibirsk, Novosibirsk Oblast, Russia
 * Paris, Île-de-France, France
 * Polyarnye Zori, Murmansk Oblast, Russia
 * Rome, Lazio, Italy
 * Saint Petersburg, Russia
 * Sverdlovsk, Sverdlovsk Oblast, Russia
 * Szczecin, West Pomeranian Voivodeship, Poland
 * Ufa, Bashkortostan, Russia
 * Vladivostok, Primorsky Krai, Russia
 * Warsaw, Masovian Voivodeship, Poland
 * Washington, D.C., United States
 * Wroclaw, Lower Silesian Voivodeship, Poland

Pony World

 * Canterlot, Equestria
 * Crystal City, Crystal Empire
 * Fillydelphia, Equestria
 * Manehattan, Equestria
 * Ponyville, Equestria