 Seven and a half hours before the expiration of the Japanese ultimatum on 22 September, Martin and Nishihara signed an agreement authorizing the stationing of 6,000 Japanese troops in Tonkin north of the Red River, the use of four airfields in Tonkin, the right to move up to 25,000 troops through Tonkin to Yunnan and the right to move one division of the Twenty-Second Army through Tonkin via Haiphong for use elsewhere in China.Already on 5 September, the Japanese Southern Army had organized the amphibious Indochina Expeditionary Army under Major-General Takuma Nishimura, it was supported by a flotilla of ships and aircraft, both carrier- and land-based.When the accord was signed, a convoy was waiting off Hainan Island to bring the expeditionary force to Tonkin.