1). Arena fight
2). Odin and his forces attack Apokolips.
Odin gets 1 week of prep. Darkseid gets what ever early warning he can get via normal means and any early warning systems he has.
3). Darkseid and his forces attack Asgard.
Darkseid gets 1 week of prep. Odin get what ever early warning he can get via normal means and any early warning systems he has.