 The 1st and 2nd Light Horse Brigades first made contact with the New Zealand Mounted Rifles Brigade by <unk> , after which Royston , commanding the 2nd Light Horse Brigade , <unk> across to explain the situation . Chaytor then moved the Auckland and Canterbury Mounted Rifles Regiments , supported by the Somerset Battery , onto high ground between the right of the light horse and the Yeomanry , which was shortly afterwards joined by the remainder of the 5th Mounted Brigade under the command of Brigadier General <unk> . At the most critical period of the day 's fighting , when the German and Ottoman force of 2 @,@ 000 dominated the Romani area from Mount Royston , the five mounted brigades ( still less the 5th Light Horse Regiment ) began their counterattack at 14 : 00 from the west towards Mount Royston . 
