 At 06 : 30 , when Lawrence ordered Chauvel to take command of all mounted troops ( excluding the Mobile Column ) , the New Zealand Mounted Rifles , the 5th Mounted and the 3rd Light Horse Brigades were somewhat scattered . By 08 : 30 , the New Zealand Mounted Rifles Brigade had reached Bir en Nuss ; there they found the 3rd Light Horse Brigade , which had been ordered to move first on Hamisah and then left towards Katia to cooperate in a general attack . The advance guard moved to fulfill these orders at 09 : 00 . At 10 : 30 , the general mounted advance began and by midday , was on a line from west of Bir <unk> to south of Katib Gannit ; in the centre the New Zealand Mounted Rifles Brigade were approaching the south @-@ west edge of the Katia oasis ; on their left the 1st , the 2nd Light Horse , the 5th Mounted Brigades and infantry in the 52nd ( Lowland ) Division were attacking Abu Hamra , to the north of the old caravan road , while the 3rd Light Horse Brigade was away to the New Zealander 's right , south of the old caravan road , attacking German and Ottoman units at Bir el Hamisah . 
