The Japanese 15th Army, 85,000 strong for the invasion of India, was essentially destroyed, with 53,000 dead and missing. Injuries and illnesses took many of the rest. There were 16,500 British casualties.
The war also gave a huge fillip to India's economy, industrialisation and employment. By the end of the war, India had, incredibly, spent more on it than Britain. On independence, Britain owed India a considerable “sterling debt”.
During the Second World War (1939–1945), India was a part of the British Empire, with the British holding territories in South Asia that included over six hundred autonomous Princely States. India officially declared war on Nazi Germany in September 1939.
It was on this date that, in accordance with the British Parliament's India Independence Act of July 18, 1947, the Union of India and Pakistan were created from the former “British India” that had been a part of the British Empire.