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The war with Yang Country ended in its demise, and the Yang Realm was incorporated into the map of Qi Country, diminishing the strategic significance of Dingyao and Pingxi, which mostly lost their roles as border regions.
As one of the nine elite forces of Daqi, the Autumn Kill Army was not going to station in the Yang Region for long. It had already withdrawn, partly to avoid alarming the other countries bordering the Yang Region.
Meanwhile, large numbers of border troops from Dingyao and Pingxi moved into the Yang Region.
Yang Country's remaining forces capable of battle had been almost completely wiped out, and they posed no threat of resistance for at least a decade, which is why Qi Country could confidently appoint former Yang Court officials like Huang Yixing.
If, after ten years, the Yang Region still could not be fully subdued, then there would be little need to keep these pacification commissioners around.