He worked at a paper mill until the outbreak of the First World War when, in September 1914, he joined the army.

He went to France in July 1915 with the King's Own (Royal Lancaster) Regiment and saw action that autumn at the Battle of Loos.

[1] Miller was a 26 years old private in the 7th Battalion, The King's Own (Royal Lancaster) Regiment during the First World War when the following deed took place on 30/31 July 1916 at Bazentin-le-Petit, France for which he was awarded the VC: For most conspicuous bravery.

Private Miller was ordered to take an important message under heavy shell and rifle fire and to bring back a reply at all costs.

He was compelled to cross the open, and on leaving the trench was shot almost immediately in the back, the bullet coming out through his abdomen.