Moreover, our aviators at that time were incomparable; and in citing the most illustrious among them one risks injustice to their companions whose opportunities were less fortunate and whose exploits were less brilliant but not less useful. The cavalry, artillery, and infantry were drawn upon for recruits for the aviation branch of the army, and it appeared a difficult undertaking to fuse such different elements; but as all shared the same life and the same dangers, had similar tastes, and a passion for attaining the same result, and as their officers were necessarily recruited from among themselves, and chosen for services rendered, an atmosphere of _camaraderie_ and friendly rivalry was created. A great novelist said that the origin of our friendships dates "from those hours at the beginning of life when we dream of the future in company with some comrade with the same ideals as our own, a chosen brother."[20] What difference does it make, then, if they depart in company for glory or for death? These young men gave themselves with the same willingness to the same service, a service full of constant danger. They were not gathered together by chance, but by their vocation and by selection, and they spoke the same language. For them, friendship easily became rivalry in courage and energy, and a school of mutual esteem, in which each strove to outdo the other. Friendship kept them alert, drove away inertia and weakness, and they became confident and generous, so that each rejoiced in the success of the others. In the mountains, on the sea, in every place where men feel most acutely their own fragility, such friendship is not rare; but war brings it to perfection. [Footnote 20: Paul Bourget, _Une Idylle tragique_.]