The adjutants general were there because they always accompanied the Emperor, and lastly and chiefly Pfuel was there because he had drawn up the plan of campaign against Napoleon and, having induced Alexander to believe in the efficacy of that plan, was directing the whole business of the war.
Yet it is only necessary to abandon the false view (adopted to gratify the "heroes") of the efficacy of the directions issued in wartime by commanders, in order to find this unknown quantity.
There are no more uses of "efficacy" in the book.
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The doctor weighed the efficacy of each treatment against potential side-effects.
They held hearings to investigate concerns about the safety and efficacy of the vaccine.