William Geoffrey Cahill, CMG, VD (7 November 1854 – 25 April 1931) was a soldier, officer and Queensland Police Commissioner in Queensland, Australia William Geoffrey Cahill was born 7 November 1854 in Strokestown, County Roscommon, Ireland.

He wrote a manual for police officers, attaching great importance to efficiency of the service, the weapons and the ammunition, modernised the education and devoted himself to the improved awareness of criminal crimes.

Mounted on a horse, Cahill responded by leading a baton charge down Albert Street to disperse the demonstrators.

[1][2] In the 1915 Queensland state election held in May, the conservative government was voted out and Thomas Joseph Ryan of the Labour Party came to power.

In March 1916, Bowman was replaced by John Huxham, who supported the establishment of a police union with which Cahill strongly disagreed.