On 23 October 1943,
Azad Hind declared war against Britain and the United States. Its first formal commitment came with the opening of the Japanese offensive towards
Manipur, code-named
U-Go. In the initial plans for invasion of India,
Field Marshal Terauchi had been reluctant to confer any responsibilities to the INA beyond espionage and propaganda. Bose rejected this as the role of
Fifth-columnists, The advanced headquarters of
Azad Hind was moved to Rangoon in anticipation of success. The INA's own strategy was to avoid set-piece battles, for which it lacked armament as well as manpower. Initially it sought to obtain arms and increase its ranks by inducing British-Indian soldiers to defect. The latter were expected to defect in large numbers. Col Prem Sahgal, once military secretary to Subhas Bose and later tried in the first
Red Fort trials, explained the INA strategy to Peter Fay – although the war itself hung in balance and nobody was sure if the Japanese would win, initiating a popular revolution with grass-roots support within India would ensure that even if Japan ultimately lost the war, Britain would not be in a position to re-assert its colonial authority. It was planned that, once Japanese forces had broken through British defences at
Imphal, the INA would cross the hills of
North-East India into the
Gangetic plain, where it would work as a guerrilla army. This army was expected to live off the land, with captured British supplies, support, and personnel from the local population.
1944 The plans chosen by Bose and
Masakazu Kawabe, chief of the Burma area army, envisaged the INA being assigned an independent sector in the
U-Go offensive. No INA units were to operate at less than battalion strength. For operational purposes, the Subhas Brigade was placed under the command of the Japanese General Headquarters in Burma. Advance parties of the
Bahadur Group also went forward with advanced Japanese units. As the offensive opened, the INA's 1st Division, consisting of four guerrilla regiments, was divided between
U Go and the diversionary
Ha-Go offensive in
Arakan. One battalion reached as far as Mowdok in
Chittagong after breaking through the
British West African Division. A Bahadur Group unit, led by Col.
Shaukat Malik, took the border enclave of
Moirang in early April. The main body of the 1st Division was however committed to the
U-Go, directed towards Manipur. Led by Shah Nawaz Khan, it successfully protected the Japanese flanks against Chin and Kashin guerrillas as
Renya Mutaguchi's three divisions crossed the
Chindwin river and the
Naga Hills, and participated in the main offensive through
Tamu in the direction of Imphal and
Kohima. The 2nd Division, under M.Z. Kiani, was placed to the right flank of the 33rd Division attacking Kohima. However, by the time Khan's forces left Tamu, the offensive had been held, and Khan's troops were redirected to Kohima. After reaching Ukhrul, near Kohima, they found Japanese forces had begun their withdrawal from the area. The INA's forces suffered the same fate as Mutaguchi's army when the siege of Imphal was broken. With little or nothing in the way of supplies, and with additional difficulties caused by the monsoon, Allied air dominance, and Burmese irregular forces, the 1st and 2nd divisions began withdrawing alongside the 15th Army and
Burma Area Army. During the withdrawal through Manipur, a weakened Gandhi regiment held its position against the advancing
Maratha Light Infantry on the Burma–India road while the general withdrawal was prepared. The 2nd and 3rd INA regiments protected the flanks of the Yamamoto force successfully at the most critical time during this withdrawal, but wounded and diseased men succumbed to starvation along the route. Commonwealth troops following the Japanese forces found INA dead along with Japanese troops who had died of starvation. The INA lost a substantial number of men and amount of materiel in this retreat. A number of units were disbanded or used to feed into new divisions.
1945 As the Allied
Burma campaign began the following year, the INA remained committed to the defence of Burma and was a part of the Japanese defensive deployments. The Second Division was tasked with the defence of
Irrawaddy and the adjoining areas around Nangyu, and offered opposition to
Messervy's 7th Indian Division when it attempted to cross the river at Pagan and Nyangyu during
Irrawaddy operations. Later, during the
Battles of Meiktila and Mandalay, the forces under Prem Sahgal were tasked with defending the area around
Mount Popa from the British 17th Division, which would have exposed the flank of
Heitarō Kimura's forces attempting to retake Meiktila and Nyangyu. The division was obliterated, at times fighting tanks with hand grenades and bottles of petrol. Many INA soldiers realised that they were in a hopeless position. Many surrendered to pursuing Commonwealth forces. Isolated, losing men to exhaustion and to desertion, low on ammunition and food, and pursued by Commonwealth forces, the surviving units of the second division began an attempt to withdraw towards Rangoon. They broke through encircling Commonwealth lines a number of times before finally surrendering at various places in early April 1945. As the Japanese situation became precarious, the
Azad Hind government withdrew from Rangoon to Singapore, along with the remnants of the 1st Division and the Rani of Jhansi Regiment. Nearly 6,000 troops of the surviving units of the INA remained in Rangoon under
A. D. Loganathan. They surrendered as Rangoon fell and helped keep order until the Allied forces entered the city. As the Japanese withdrawal from Burma progressed, other remnants of the INA began a long march overland and on foot towards Bangkok. In what has been called an "epic retreat to safety", Bose walked with his troops, refusing to leave them despite Japanese soldiers finding him transport. Bose returned to Singapore in August to what remained of the INA and
Azad Hind. He wished to stay with his government in Singapore to surrender to the British, reasoning that a trial in India and possible execution would ignite the country, serving the independence movement. He was convinced not to do so by the
Azad Hind cabinet. At the time of Japan's surrender in September 1945, Bose left for
Dalian near the Soviet border in
Japanese-occupied China to attempt to contact the advancing Soviet troops, and was
reported to have died in an air crash near Taiwan. The remaining INA troops surrendered under the command of M.Z. Kiani to British-Indian forces at Singapore. ==End of the INA==