The offensive waged in May Juche 28 (1939) is recorded in the history of the Korean people's anti-Japanese armed struggle as the largest one of weighty significance, together with the Battle of Pochonbo (June 1937), among the military operations conducted by the Korean People's Revolutionary Army (KPRA) in the homeland.

In the light of the Japanese imperialists' false propaganda that the KPRA was annihilated, the President decided to launch a military offensive in the homeland to instill the confidence in victory into the Korean people and deal a heavy political and military blow to the enemies.

Under the policy of offensive in Musan area set forth by the President at the Beidadingzi Meeting in April 1939, the main forces of the KPRA waged a spring counteroffensive action to destroy the enemies' important positions in the border area along the River Amnok to make a breach for advancing operation into homeland.

The main forces crossed the Amnok River on May 18 and advanced into Musan area through "Kapsan-Musan guard road" after passing through Chong Hill, Konchang, Pegae Hill and Samjiyon.

The Japanese imperialists built the "guard road" in order to keep the KPRA from advancing into the homeland. So, the fact that the main forces of KPRA marched along the "road" in the daytime caused a great sensation.

When the enemies were taken aback by the tactic of marching a long distance at one step, the KPRA conducted military and political activities in the areas of Sinsadong and Singaechok on May 22.

The next day, the KPRA annihilated the enemies with the tactics of allurement and ambush in Taehongdan Plain and the offensive in Musan area was completed victoriously.

The battles in the Musan area gave a telling blow to the Japanese imperialists hell-bent on continental aggression. And they were assistance to neighboring countries in their revolutionary struggle and encouragement to the national liberation movement of the oppressed people of the world against the imperialists' aggression and subordination.