He then entered the École Supérieure de Guerre in 1896 where he changed is path of career to the regular Infantry of the French Army.

A proponent of the offensive against the German Industries, Barès pioneered aerial bombing, but forbade attacks against cities and civilian targets.

In September 1915 he was promoted to lieutenant colonel, but with the appointment of General Robert Nivelle as commander-in-chief of the French armies in December 1916, Barès was replaced by Paul du Peuty.

On 15 February 1917 Barès assumed the post of air commander of the eastern front, with particular responsibility for the sector of Verdun.

In December 1936, then Minister of the Air Pierre Cot awarded him the Military Medal, an honour rarely bestowed on general officers.