Harry Gray was the eldest son of Walter & Ellen. He was born in Luton in 1885.

Aged 18 years, he joined the Royal Regiment of Artillery, Royal Garrison Artillery on 3rd December 1901 as Gunner 9858. On his service record he is described as having a sallow complexion, hazel eyes & black hair & he has a tattoo of spots & cross on his right forearm. He also has 2 scars above his left buttock.