This force, which may have been 7,000 strong, moved out from El Arish just after midnight, following an unexpected delay caused by incoming infantry columns of the 52nd (Lowland) Division, which crossed the long camel train carrying water which followed the mounted division. Nevertheless, the Anzac Mounted Division (riding for forty minutes, dismounting and leading their horse for ten minutes and halting for ten minutes every hour) reached the plain from Magdhaba, at about 05:00 on 23 December. The column had been successfully guided by brigade scouts, until the garrison's fires had become visible for about an hour during their trek, indicating the Ottomans did not expect an attacking force to set out on a second night march, after their ride to El Arish.