The force that entered the Alfonso Star Domain was the main fleet personally led by Gu Hang.
In terms of fleet strength, it was significantly more powerful than what was left in Matins' hands. Additionally, there were two visible battle groups, one Shadow Battle Group, and a large number of Alliance Army troops.
Such strength was aimed at resolving the issues in the Alfonso Star Domain swiftly and decisively.
Especially to secure control over the three Founding Worlds, which represented immense wealth.
The reasons for investing such overwhelming forces into the Alfonso Star Domain primarily boiled down to two:
First, leveraging Sebastian Moro's influence to quickly draw the Dove Faction to their side.
War is the fiercest form of politics. Achieving an objective solely through martial means is exhausting.
Success is uncertain.
Even if success is achieved, the costs—both in resources and time—are unpredictable.