In fact, Sheng Da knew long ago why it was necessary to defend those barren planets to the death; it was to give the members of the Hundred Battle Alliance the illusion that the Huaxia Empire valued these planets greatly.
As for why they are abandoning them now, it's because it's finally time to use these planets.
Boom!
A deafening roar, due to the transmission of soul energy, resounded in this area of outer space, exploding in everyone's ears, rumbling with a constant hum.
A wide soul energy beam, as vast as a river, suddenly shot straight forward from the original position of the fleet led by Sheng Da.
Not only that, but there were several such beams in the distance, spanning across the starry sky, rushing towards far horizons.
"Look, this is the soul cannon, known as the Destruction Blast Soul Cannon, the strongest soul cannon currently usable by the Huaxia Empire." Sheng Da, standing on the deck, spoke to the clansmen beside him.
