[5][6][7] He was described as "a great centre-forward" who possessed "an invaluable capacity for keeping opposing defences guessing".
[8] At the outbreak of the First World War in 1914, Warren was the licensed victualler of the Three Tuns Inn, Hinckley.
[8] In December 1915, 18 months after the outbreak of the war, he enlisted in the Army Reserve and remarried in 1916 and had another child.
[8] In April 1917, Warren was posted to the Western Front as a private in the Army Service Corps and was killed just one month later in the Loos Salient, while serving with the York and Lancaster Regiment.
This biographical article related to association football in England, about a forward born in the 1880s, is a stub.