HistoryData
Historical ConflictPleiku

Operation Lincoln

Operation Lincoln was a 1966 U.S. 1st Cavalry Division sweep west of Pleiku aimed at disrupting North Vietnamese offensive preparations before the monsoon season.

Duration & Scope

1966 ongoing

< 1 year

Key Facts

Dates
25 March – 8 April 1966
Duration
14 days
U.S. unit
1st Cavalry Division
Helicopters lost
2
Enemy force encountered
~1,000 North Vietnamese soldiers

Strategic Narrative Overview

From 25 to 29 March, American units conducted multiple skirmishes that yielded inconclusive results. The operation's critical moment came when U.S. scout helicopters inadvertently landed amid an active North Vietnamese way-station surrounded by approximately 1,000 enemy soldiers. Two American helicopters were shot down in the ensuing firefight, but ground and air forces responded and fought to secure the area.

01 / The Origins

By early 1966, North Vietnamese Army and Viet Cong forces were believed to be establishing bases and logistical way-stations west of Pleiku in the Central Highlands of South Vietnam. U.S. commanders feared these positions would support major offensives once the monsoon season provided cover. The 1st Cavalry Division was tasked with locating and disrupting these suspected installations before they could be fully activated.

03 / The Outcome

After American forces secured the contested way-station area, North Vietnamese troops withdrew toward the Cambodian border. U.S. commanders declared the operation a success, citing the disruption of the enemy logistical network and the prevention of any planned offensive in the Pleiku region ahead of the monsoon season. No major territorial changes resulted from the operation.

Belligerents & Mobilization Analysis

Side A

1 belligerent

United States (1st Cavalry Division)

Side B

1 belligerent

North Vietnamese Army / Viet Cong
Peak Mobilized Forces~1K
Forces vs Casualties ratio
0Mobilized
Outcome
U.S. declared operation a success; North Vietnamese forces withdrew toward the Cambodian border; two U.S. helicopters lost.

Kinetic Engagement Axis

Major engagements timeline (1966–present)Timeline of major military engagements plotted chronologically.1966present1966Way-station enga…Allied

Scroll horizontally to view full axis. Events plotted relatively.

Side A victorySide B victoryInconclusiveDecisive / turning point

Location

Map of Pleiku, VietnamMap of Pleiku, VietnamPleiku, Vietnam