Bone Shards clearly know that this direction is not only the fastest route to advance, but also where the general command of the human army is located on the surface of Ancache VIII.
It's possible that Bone Shards also knows exactly who the ground commander is.
As long as he extinguishes the command center for the humans' coordinated multi-directional operations, it might not win the war, but it can at least throw the human side's offensive into disarray temporarily and ease his own pressure.
What he seeks is merely an extended delay in the progress.
Martins quickly realized that Bone Shards' attack was targeting him.
He first arranged the defense line to intercept, and also called for bombardment support from the fleet's guns.
But Bone Shards' attack could not be stopped.
