Stealth Raiders

In 1918 a few daring low-ranking Australian infantrymen, alone among all the armies on the Western Front, initiated stealth raids without orders. These stealth raiders killed Germans, captured prisoners and advanced the line, sometimes by thousands of yards. They were held in high regard by other men of the lower ranks and were feared by the Germans facing them. Who were these stealth raiders and why did they do it? What made Australian soldiers take on this independent and personal type of warf