Transform into a Border Soldier and Awaken the Array System

In the northern border, the war smoke is constant all year round, the military equipment of the deserted garrison is depleted, the old defensive formation is full of loopholes, and the soldiers live under the shadow of the cavalry every day. Lin Chen, a modern ordinary person, accidentally traveled through time and possessed a low-level border guard, and accidentally awakened the formation deduction system. He abandoned the rigid dogma of ancient formations, adapted to local conditions, repaired the weak points of the formation with limited armor, established his authority in a battle on the school field, and reversed the prejudice in the army. Since then, he has built forts, trained infantry, and studied formations. He has defended the barbarians on the grasslands with square-inch formations, defended the common people on the frontier, and protected the northern frontier of Daxia. A small soldier, by deducing formations, has created a legend.