Falls rejected claims that British methods were predictable, noting that attacks had been made at dawn, noon, afternoon and at night. Bombardments had been fired before some attacks, during attacks on other occasions, on call from the infantry or were dispensed with. Attacks had been made indirectly, using ground for cover and a number of outflanking moves had succeeded. Combined operations with infantry, cavalry, cyclists, armoured cars and aircraft had also occurred. The most successful divisions in the pursuit were those that had been on the Somme for a considerable time, rather than the newer divisions, which were fresh and had trained for open warfare in England. Many of the British attacks had substantial casualties, mostly from German machine-gun fire, although artillery casualties were also high. Attacks on similar objectives using different methods had similar casualties, which suggested that losses were determined by the German defence, rather than unsatisfactory British methods. British field artillery had been supplied with an adequate amount of ammunition, despite the transport difficulties but much heavy artillery was left behind.