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The camp was roughyl located right next to the barrier of the city, and only about a hundred kilometers from the battlefield. The other half of the army was in a constant clash against the Wrath Layer's Barbarians, which seemed to be coming endlessly from the Demon Gates that spawned out of nowhere.
Mammon explained to me that Satan managed to break through the boundaries between Layers using his sheer strength and Archdemon authority, using his real body to open a huge crack in space, or many, that led all his army here.
Of course, this is something that every Archdemon could do, but it usually costs a great deal of Infernal Essence, and that's not something they would like to waste, even less to waste their armies on pointless battles.