[1] Together with the Carlier brothers, Ernest Tossier, and Eugène Maës, he played a crucial role in helping Olier win the FGSPF Football Championship in 1908, and this victory allowed the club to compete in the second edition of the Trophée de France in 1908, an inter-federation national competition organized by the CFI, in which he started in the final as a halfback, helping his side to a 3–0 win over SM de Puteaux, the Parisian champion of the FCAF.
[1][2][3][4] Along with goalkeeper Louis Tessier, they formed a decent defensive partnership that held up very well, until 10 minutes from the end, during which they conceded four goals due to the fatigue of certain players; France lost 2–5 loss.
[1] Guerre and Tossier remain the only players of Patronage Olier to have represented the French national team,[8] probably because the PO leaders did not want to make any other exception.
[1] At the time, every soldier, although demobilized and returned to civilian life, had to complete periods of military exercises, and on 4 February 1924, Guerre was promoted to reserve lieutenant.
[1] Just three weeks later, however, Guerre died in Neuilly-sur-Seine on 29 February 1924, at the young age of 39, most likely due to having been poisoned by a colleague who got jealous of his promotion.