The French had made the grave error of concentrating on evidence that supported their assumptions rather than assess German capacity and give credence to reports that the Germans were not conforming to French expectations. The French had based their strategy on a theory of methodical battle and firepower against a German theory of manoeuvre, surprise and speed. French centralised authority was not suited to the practice of hasty counter-attacks or bold manoeuvres, sometimes appearing to move in "slow motion".[32]