This article from the Illustrated London News (June 30th 1900.) shows the men of the Hong Kong Regiment preparing to depart to Tientsin
“From Hong Kong, the Gibraltar of the East , a force has been moved towards Tientsin consisting of 300 Welsh Fusiliers and 900 Indian troops.
The Hong Kong Regiment is under the command of Lieutenant-Colonel Retallick of the 45th Sikhs. He is forty-three years of age and saw service in the Afghan War of 1880, for his conduct in which he was decorated and mentioned in Dispatches.