In air services, in petrol transport, and in the art of field defences, also, the French were outmatched. Aviation was essentially their sport and science; but the army had shown little interest in it, and had made only a beginning in its two main functions——general reconnaissance and the ranging of artillery fire.[7] Thus ill-prepared for a modern large-scale offensive, France had not acquired the material or the tactic of a strategical defence. The light and rapid “75” had been thought of almost exclusively as an arm of attack, in which weight and range were now become the master properties. Its remarkable qualities for defence began to appear in the unfortunate actions presently to be traced, and were only fully understood many months later, when “barrage” fire had been elaborated. The mitrailleuse was essentially a French invention; but its greatest value——in defence——was not yet appreciated. The numerical provision of machine-guns was the same as that of the German Army (though differently organised). It was owing to a more considerable difference of tactical ideas that a legend grew up of an actual German superiority in this arm. In the French Army, all defensive methods were prejudiced; in the German, they were not. The deep trenches that might have saved much of Belgium and northern France were scouted, until it was too late, as incompatible with the energy and pride of a great army. The lessons from recent wars drawn, among others, by the Russian State Councillor, Jean de Bloch, fifteen years before,[8] went for nothing. “It is easy to be ‘wise after the event,’” writes Field-Marshal French; “but I cannot help wondering why none of us realised what the most modern rifle, the machine-gun, motor traction, the aeroplane, and wireless telegraphy would bring about. It seems so simple when judged by actual results.... I feel sure that, had we realised the true effect of modern appliances of war in August 1914, _there would have been no retreat from Mons_.”[9]