In addition to these, they also brought 30 Seventh Order, 326 Sixth Order, and 1000 mercenaries purchased from "Element Camp."
The reason they didn't immediately deploy their strongest lineup was because the Blue Star Humans wanted to use this opportunity to deplete some of the Skuru forces during the attack on Spring Eye.
If the Skuru defenders saw the Blue Star Humans and simply retreated, maintaining their overall strength intact, it would only make the future final battle even harder to fight.
The Blue Star Humans wanted to engage with a nearly equal force, aiming to draw the Skuru into a war of attrition without letting them escape hastily.
The Skuru defenders noticed the overt tactics of the Blue Star People and, seeing that the forces dispatched by the Blue Star Humans were so few, they too entertained the idea of engaging in a war of attrition.
Both sides found their interests aligned, and thus a fierce war of attrition began around the Spring Eye at the South Pole.