Allied versions of infiltration tactics were first formally proposed by French Army captain . In 1915 Laffargue published a pamphlet, "The attack in trench warfare", based upon his experiences in combat that same year. He advocated that the first wave of an attack identify hard-to-defeat defenses but not attack them; subsequent waves would do this. The French published his pamphlet "for information", but did not implement it. The British Empire armies did not translate the pamphlet, and the British Army continued to emphasise fire power, although Laffargue's proposals were gradually adopted informally, first by the Canadian Corps. The U.S. "Infantry Journal" published a translation in 1916.