 Having been held south of Romani , the German and Ottoman force attempted a further outflanking manoeuvre to the west , concentrating 2 @,@ 000 troops around Mount Royston another sand dune , south @-@ west of Romani . At 05 : 15 , the Ottoman 31st Infantry Regiment pushed forward ; then the 32nd and the 39th Infantry Regiments swung around the left and into the British rear . This outflanking movement was steadily progressing along the slopes of Mount Royston and turning the right of the 2nd Light Horse Brigade , whose third regiment , the Wellington Mounted Rifles , was now also committed to the front line . 
