No artillery - fire had been opened before the attack .
The Germans were surprised as bombers of the 8th Brigade advanced 300 yd ( 270 m ) but then had to retire 200 yd ( 180 m ) when they ran out of bombs .
No artillery - fire had been opened before the attack and the Germans were surprised as bombers of the 8th Brigade advanced 300 yd ( 270 m ) but then had to retire 200 yd ( 180 m ) when they ran out of bombs .