Wu Tai was not certain whether Gu Changqing would return to attack.
But his years of experience had taught him one thing.
All was fair in war.
That held true at any time.
Moreover.
Anything that might happen, even if the chance was infinitesimal, could not be ignored.
One must not assume that no other powers existed simply because Great Zhao ruled the world.
Back when the Demon Race was still around.
There had been numerous nations, large and small, throughout the world.
Only after the Demon Race retreated had Great Zhao swept across the land under the Human Emperor's leadership and finally established its dominion.
However—
Even that did not mean all the other small nations had submitted or been destroyed.
For a period after Great Zhao established its rule.
Its armies had continued campaigning in the north and south.
Only within the last century had all other powers finally been swept away, leaving Great Zhao as the world's sole voice.
During those campaigns against the various nations.
Wu Tai was one of the generals and understood the ways of marching and warfare far better than most.
Otherwise.
He would not have qualified to be one of the leading generals on this expedition, second only to Yan Caizhe.
Elsewhere.
Qin Shujian had already begun preparing to lay out the array.
For an Array Dao Grandmaster.
The simplest, most direct, and most exhausting method was the Void Inscription Array: with a wave of the hand, one inscribed an array in the void, letting Divine Sense drain away like a rushing tide as one laid down a Grand Formation.
But that method.
First, consumed too much energy.
Second, his Divine Sense could not cover an entire city.
Thus.
Qin Shujian adopted the second method for setting up his array.
Array disks.