Parr became an
infantry scout with the 4th Middlesex, whose role was to ride ahead of the battalion on the march with a detachment mounted upon bicycles to detect the enemy, or points of military note, and then return with all possible speed to notify the Battalion's Commanding Officer as to what lay ahead. On the outbreak of the
World War I in early August 1914 the 4th Middlesex was mobilized, and was among the first British Army units of the
British Expeditionary Force (BEF) to cross the
English Channel to France. With the
Imperial German Army invading Belgium and France at that moment, Parr's unit took up positions near the village of
Bettignies, beside the canal running through the town of
Mons, approximately away. On 21 August 1914, Parr and another cyclist were sent to the village of
Obourg, just northeast of Mons, and slightly over the border in Belgium, with orders to locate where the Germans were. It is believed that whilst doing this they encountered an
Uhlan patrol from the
German First Army engaged in the same work, and that Parr remained to hold off the enemy whilst his companion returned to report. He was killed in an exchange of rifle fire aged 17. As the British Army retreated from the area shortly afterwards, Parr's body was left behind, and with the absence of confirmation of his fate Parr's death was not officially recognised until much later in the conflict. His mother wrote to his regiment's headquarters asking about her son, but it was unable to state with certainty what had happened to him. ==Grave==