On the morning of 11 June, the orders for the attack were given to 42 CDO by Lieutenant Colonel Vaux. K Company was ordered to attack the eastern end of the mountain, while L Company would attack the southern side an hour later, where if the mountain was secured, would move North to occupy Goat Ridge. J Company would launch a diversionary attack (code-named Vesuvius) on the western end of Mount Harriet. If these objectives fell quickly, 42 CDO would proceed to capture Mount William.