During the First World War, he commanded the Bikaner Camel Corps, which served in France, Egypt and Palestine.

Maharaja Ganga Singhji was the first prince in Rajputana to grant full charter of powers to a high court.

He was an Honorary ADC to the Prince of Wales when he visited the United Kingdom for the Coronation in 1902,[3] later serving him when he became His Majesty King George V, the King-Emperor, in 1910.

In July 1897, he married Maharani Vallabh Kanwar (known in Bikaner as "Maharani Ranawatiji" in honour of her native clan), daughter of Maharawat Raghunath Singh Bahadur, ruler of Pratapgarh State; she bore three children and died in August 1906.

The lady, known in court as "Maharani Tanwarji" in honour of her native clan, died without progeny in 1922.

Known as "Maharani Sri Bhatianiji" in honour of her native clan, she bore three children and died in November 1945, surviving Ganga Singh by more than two years.

He died on 2 February 1943 in Bombay after a reign of 56 years, aged 62, and was succeeded by his son Sadul Singh as His Highness the Maharaja Sahib of Bikaner.