After exiting the Warp Bubble, the Star Alliance warships immediately launched an attack on the Enslavers' Warship. An asteroid belt is the best formation to sever a fleet's overall formation, and in this preset battlefield, the Star Alliance Universe Army had already conducted many tactical simulations.
In fact, the outnumbered Star Alliance warships didn't form their own formations at all, they followed AI-guided preset attack positions, directly targeting the enemy on the battlefield.
If one were to draw an analogy with ancient military formations, a normal star battle might resemble the collision of two neatly organized infantry phalanxes, whereas battling in an asteroid belt sown with mines evoked a more dispersed urban warfare with various covers.