Sector Epsilon 51-3 was a sector situated within the dominion of the First Order, an area they prohibited access to for outsiders. As the occupation of the Colossus platform on Castilon unfolded, Commander Pyre spearheaded stormtroopers in apprehending Team Fireball. This action followed a notification indicating that the team's vessel, the Fireball, was observed taking part in a Resistance mission within the sector, uncovering evidence suggesting the presence of Starkiller Base.