He was warmly received in Japan and was declared the head of the Indian army, which consisted of about 40,000 soldiers from Singapore and other eastern regions.
These soldiers were united by another great revolutionary Rash Behari Bose. Rash Behari handed the soldiers over to Netaji Subhash Chandra Bose.
Netaji Bose called it the Indian National Army (INA) and a government by the name "Azad Hind Government" was declared on 21st of October 1943.