It was a powerful war tactics to protect manpower and combat tactical equipment as much as possible from strikes by the enemies' modern weapons and wipe out the enemy troops as many as possible.

Its might was well evidenced by the battle on Hill 153.7 in the eastern part of the front held in July Juche 41 (1952). In an attempt to occupy the hill defended by a company of the Korean People's Army, the enemies turned it into a sea of flames through air bombing and fire of thousands of shells and fed a specially-trained regiment. However, the KPA company could defend the hill by means of tunnel tactics, without any loss on its part and leaving more than 900 enemy troops dead or injured in the 14 hours-long fierce battle.

The tactics also led the battles on Height 1 211 to victory. In 1952 alone, the aggressors dropped 4 160 bombs and showered 527,260 shells per one square kilometer on the height. But, the battles ended with the victory of the KPA.

The tactics, which displayed its vitality in the whole period of the 4th stage of the Fatherland Liberation War, was initiated by President Kim Il Sung in summer of 1951.

At that time, mountains, ridges and valleys on the mainly-fixed front were reduced into a sea of fire due to the enemies' ceaseless bombing and shelling. Under the prevailing situation, the President set forth a tunnel tactics based on the mountainous areas and saw to it that the defensive position based on tunnel was built on all the heights of tactical importance.

By the Korean-style tunnel tactics, the enemies' myth of "mightiness" went into pieces and their military and technical superiority crumbled like a wet mud well.