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Historical ConflictGuanjianao

Battle of Guanjianao

The Battle of Guanjianao was the costliest offensive battle for the Eighth Route Army in the Second Sino-Japanese War and is counted among Peng Dehuai's four major defeats.

Duration & Scope

1940 ongoing

< 1 year

Key Facts

Dates
30 October – 1 November 1940
Eighth Route Army strength
~20,000 troops
Japanese garrison size
~500 soldiers
Duration
2 days and nights of fighting
Part of
Third phase of the Hundred Regiments Offensive

Strategic Narrative Overview

From 30 to 31 October 1940, the Eighth Route Army concentrated nearly 20,000 troops to besiege roughly 500 Japanese soldiers holding Guanjianao. Despite overwhelming numerical superiority, two days and nights of intense combat failed to annihilate the Japanese garrison. The defenders held out long enough for relief forces to approach, fundamentally altering the battle's course.

01 / The Origins

The Battle of Guanjianao arose during the third phase of the Hundred Regiments Offensive, a major Chinese Communist operation in North China in 1940. Following earlier sabotage campaigns by the Eighth Route Army against Japanese infrastructure, the Imperial Japanese Army launched a counteroffensive that pushed close to Eighth Route Army headquarters, setting the stage for a direct Chinese attempt to destroy isolated Japanese positions.

03 / The Outcome

On 1 November 1940, Japanese reinforcements reached Guanjianao, compelling the Eighth Route Army to withdraw without achieving its objective. The battle ended as a Chinese failure and became one of the most controversial engagements of the Hundred Regiments Offensive. Commander Peng Dehuai later cited it as one of the four greatest defeats of his military career.

Belligerents & Mobilization Analysis

Side A

1 belligerent

Chinese Communist Eighth Route Army
Peak Mobilized Forces~20K
Forces vs Casualties ratio
0Mobilized
Key Commanders

Peng Dehuai.

Side B

1 belligerent

Imperial Japanese Army
Peak Mobilized Forces500
Forces vs Casualties ratio
0Mobilized
Outcome
Japanese defensive victory; Eighth Route Army withdrew after failing to annihilate the garrison before reinforcements arrived.

Kinetic Engagement Axis

Major engagements timeline (1940–present)Timeline of major military engagements plotted chronologically.1940present1940Battle of Guanji…Side B

Scroll horizontally to view full axis. Events plotted relatively.

Side A victorySide B victoryInconclusiveDecisive / turning point

Location

Guanjianao, China