In 1882 Tucker, his wife Louisa and three other officers began the work of The Salvation Army in India and Tucker took on the name of FAKIR SINGH.

While in India, Louisa Tucker died during a cholera epidemic. In 1888, Frederick married Emma Booth, who also became ill during the time of their stay in India and so they departed Fredericks' beloved land of India.

Tucker served the Lord at the International Headquarters of The Salvation Army in London until the Tuckers were appointed to lead The Salvation Army in the USA. In 1903 Emma Tucker died in a train accident during their time in the States. Frederick was called back to work at the International Headquarters, although he rather would have returned to India.

In 1906, Frederick Tucker married Colonel Minnie Reid, who had had a similar upbringing to her husband. In 1907, the Tuckers sailed for India, where they served for a number of years