The Battle of An Lão took place in the An Lão District of Bình Định Province, just over 300 miles north-east of Saigon between December 7–9, 1964. The battle was part of a larger 5th Military Region operation known as Campaign An Lão to capture An Lão valley, and use it as a corridor between their military bases in Quảng Ngãi Province and Bình Định Province.
The Battle of An Lão was initiated by offensive actions conducted jointly by People's Army of Vietnam (PAVN) forces and Viet Cong (VC) guerrillas when they captured the An Lão district headquarters in the coastal Bình Định province within the II Corps tactical zone. For three days, this joint military force successfully repelled large numbers of counterattacking Army of the Republic of Vietnam (ARVN) troops.
This battle was the first time in northern South Vietnam (South Central Coast of the united Vietnam) and the Central Highlands that the PAVN and VC "used the new tactic of coordinating main force units with local and guerrilla forces."

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