In the Northern Frontier, the fires of war never die out. The garrison at Huangtun is poorly equipped, its old defensive formations riddled with gaps, and its soldiers live every day in the shadow of the enemy cavalry.
Lin Chen, an ordinary modern man, transmigrates by chance into the body of a low-ranking frontier conscript and unexpectedly awakens a Formation Deduction System.
Rejecting rigid doctrines of ancient formations, he adapts to the terrain and uses his limited weapons and armor to shore up weaknesses in the ranks. He makes a name for himself in a training-ground battle and turns the army's prejudice around.
From then on, he fortifies the garrison, trains the infantry, and studies formations, using compact battle arrays to repel the barbarian tribes of the grasslands, defend the people of the frontier, and protect the northern borders of Great Xia. Watch as an ordinary soldier uses his mastery of formation deduction to carve out a legend.
Well written, all the world's thoughts and feelings are reflected in it