Beyond a few desultory shells the British artillery was practically inactive. Fritz had already been used to a furious bombardment as a preliminary of a "big stunt". For change, he was not being warned in this fashion, and, consequently, although expecting an attack within the next few days, the absence of a downright strafe put him off his guard. Nevertheless, the German guns on the spur of Messines Ridge, and miles beyond the heights, were persistently "watering" the ground behind the British lines.