During the resistance war against the US, facing difficulties in the battlefield of Zone 5, in 1963, Comrade Chu Huy Mân was sent by the Party Central Committee and President Hồ Chí Minh to the Central Highlands, where he studied and directed the armed forces in Zone 5 to fight against the "local war" strategy of the US imperialists.

Photo: Political Commissar of Military Zone 5 Chu Huy Mân and Comrade Trần Văn Trà exchanged views at the Central Bureau of the Southern Department, in 1966

Comrade Chu Huy Mân's most important achievement as a commander in the anti-American resistance war was achieved when he was in the battlefields of Zone 5- Central Highlands from September 1963 to 1975. It was a long journey full of hardships and challenges that he "carried on both shoulders" as a leader. He commanded militarily and politically on a fierce battlefield.

Photo: Comrade Chu Huy Mân on the battlefield in the inter-zone V, 1967

Once President Hồ was exchanging ideas with other comrades on the battlefield, knowing that Chu Huy Mân was shouldering both tasks (commander, political work), President Hồ Chí Minh encouraged:
"Take pains to carry them on both shoulders, it’s good”. Since then, the soldiers of Central Highlands Army used to call General Chu Huy Mân by the alias "Hai Mạnh"

Photo: Uncle Hồ visited and talked with the armed forces in Inter-zone IV, Commander - cum - Political Commissar, Secretary of the Party Committee of Military Region IV, Chu Huy Mân - the first person from the left

During General Offensive and Uprising on the Lunar Tet holiday 1968, Mr. Chu Huy Mân, as Commander of Military Zone 5, commanded part of commando forces to use mortars to launch an attack the US and the Republic of Vietnam soldiers in the city. At the same time, he ordered a withdrawal of the remaining forces to rural areas to maintain the battle position. This policy of Military Zone 5 was praised by the Politburo.

Photo: Comrade Chu Huy Mân and comrades of Party Committee V in 1972

In the spring of 1975, after the victory of the Central Highlands campaign, the Commander of the Military Zone V Chu Huy Mân asked the Standing Committee of the Party Committee and the Military Zone to speed up the attack , so they were able to destroy the Division 2 of the Saigon army and liberated Tam Kỳ (Quảng Nam province). Later, he also contributed to the campaign to liberate Đà Nẵng.

Photo: General Võ Nguyên Giáp and comrade Chu Huy Mân, the photo was taken shortly after Đà Nẵng was liberated in 1975.

With his great contributions, he was promoted from Major General to Lieutenant General in 1974, and to General in 1980.