In April 1944, on a heavily contested ridge in the hills of Nagaland, a small garrison held a fortified perimeter just a few hundred yards wide. They fought from shattered bungalows and deep trench networks where opposing forces were separated by little more than the width of a tennis court.

Roughly 1,500 combat troops manned the immediate Kohima perimeter against an advancing force of about 15,000 Japanese troops, while a broader administrative and defensive network brought total allied personnel in the wider Kohima area to roughly 2,500.

For weeks under the spring sun, they endured artillery barrages and close-quarter combat through punishing weather, knowing that if this mountain ridge fell, the vital road linking Imphal with Dimapur would be cut off.

The Crossing of the Chindwin

The struggle for that ridge was part of a major military confrontation that had begun in March 1944, when the Imperial Japanese Army crossed the Chindwin River and pushed deep into the hill country of northeast India.

Lieutenant General Renya Mutaguchi had launched Operation U-Go with roughly 85,000 men from the Japanese Fifteenth Army, a force comprising three infantry divisions alongside one division from the Indian National Army.

The goal was to seize the British supply base at Imphal and cut communications before an allied counter-offensive could be launched from India, with the Japanese 31st Division advancing to capture Kohima, isolate Imphal, and push onward toward Dimapur.

The Human Toll on Mountain Villages

For the local populations of Manipur and Nagaland, the arrival of rival armies brought severe disruption and hardship. Villages found themselves caught directly between advancing columns and defending troops.

Fields were trampled, traditional homes were commandeered or destroyed by artillery fire, and civilians were pressed into labor to haul ammunition and carry wounded soldiers along steep jungle tracks.

Food supplies vanished as hungry troops scavenged the countryside, leading to severe shortages and distress in remote settlements. As the fighting dragged on, military camps and neighboring civilian hamlets dealt with the rising strain of local logistical pressures and movement restrictions.

A Supply Line Fought in the Sky

The strategic layout of the offensive hinged entirely on geography. The road linking Imphal with Dimapur ran right through the mountain pass at Kohima.

If the Japanese captured the ridge, the divisions stationed in the Imphal plain would lose their primary logistical lifeline. While the garrison on Garrison Hill held the ridge against overwhelming odds, the main British and Indian forces around the Imphal plain found themselves cut off by Japanese troops who had severed the surrounding roads.

Faced with this encirclement, allied commanders chose to hold their ground and rely on aviation to maintain combat effectiveness. Backed by transport aircraft, the allies launched a massive aerial resupply effort.

Royal Air Force and allied transport planes flew over the mountains day and night, delivering roughly 19,000 tons of supplies and more than 12,000 fresh personnel, while evacuating about 13,000 casualties from the encircled forces.

The Turning Point in the Rains

As the campaign continued through June and into July 1944, the military balance shifted decisively. The Japanese advance had outpaced its supply lines, and soldiers subsisted on minimal rations while disease and exhaustion swept through their ranks, turning the mountain tracks and defensive positions into waterlogged ground.

Relief columns pushing south from Dimapur broke through to relieve the core Kohima garrison by mid-April 1944, and subsequent operations cleared the road. British and Indian forces advancing from Kohima met troops moving north from Imphal at Milestone 109 on June 22, 1944, reopening the road between the two fronts.

Following severe supply shortages, disease, and exhaustion, and after launching repeated infantry assaults, the depleted Japanese forces were pushed back by allied forces and forced into a difficult retreat across the Chindwin River during the summer months.

This marked one of the greatest military defeats for Japan in the region, serving as a major turning point in the Burma Campaign, and helping set the stage for the Allied reconquest of Burma, remembered today through the solemn verses inscribed at the Kohima War Cemetery.

Frequently Asked Questions

When did the battles of Imphal and Kohima take place?

The overall battles were fought between March and July 1944, coinciding with the Japanese U-Go offensive into British India. Intense combat lasted for nearly four months before the Japanese advance was halted and forced into retreat.

How many troops were involved in the campaign?

The initial Japanese offensive involved roughly 85,000 troops under the Fifteenth Army, comprising three infantry divisions and one Indian National Army division. On the opposing side, the British Fourteenth Army and associated Indian Army forces massed over 120,000 personnel to defend Imphal and relieve Kohima, supported extensively by transport aviation.

What were the casualty figures for both sides?

According to official National Army Museum figures, the Japanese Fifteenth Army suffered roughly 53,000 dead and missing, driven heavily by starvation, disease, and exhaustion during the retreat. British and Commonwealth forces sustained approximately 12,500 casualties at Imphal and about 4,000 at Kohima.

Which military forces fought in the campaign?

The campaign primarily pitted the Imperial Japanese Army against the British Fourteenth Army, which included British, Indian, Gurkha, and African units, alongside elements of the Indian National Army fighting alongside Japanese forces.

What was the strategic outcome of the battles?

The engagement resulted in a decisive Allied victory that eliminated the immediate threat to British India, secured the eastern frontier, and served as a critical turning point for the Allied counter-offensive in the Burma Campaign.