231st Brigade on the right moving towards Mezra ash Sherqiye north north west of Tell 'Asur. But the difficult night advance was further complicated by the terrain and Ottoman machine guns and despite reinforcements being brought forward, the infantry were held up later in the day by the cavernous gorge of the Wadi el Jib. Operating in two groups; the 10th (Irish) Division's right attacked Atara and Ajul and the left attacked from Deir es Sudan to Nabi Salih. After a late start due to fog rapid advances were made and during the following night the advance continued on most of the front. The bridge over the Wadi el Jib was found to be intact and the top of the cliff was won just before dawn. Daylight found them on the lower slopes of the hills while Ottoman machine gun defenders made determined stands. During these operations the infantry advanced up and down precipitous cliffs and through deep gorges with every Ottoman machine gun carefully placed in strong defensive positions. These had to be located by careful reconnaissance on foot as the country was very rough and due to the low cloud and mist aerial reconnaissance could not be used. Artillery was also severely hampered by the rough terrain making it virtually impossible to produce effective artillery fire support. Against the Ottoman Eighth Army On the plain the operations of the XXI Corps were carried out without any of the difficulties suffered by the XX Corps. The XXI Corps moved its right forward from the Wadi Deir Ballut to Ras el Ain and secured a commanding position near Abu Tellul and Musallabeh which overlooks the Jordan Valley and the Beisan to Jericho road. Their final objective was a line north of the Wadi Deir Ballut (which becomes the Wadi el Jib) and the Wadi Abu Lejja where it enters the Nahr el Auja north of Mulebbis an advance of . After the passage of the Nahr el Auja an advance had reached El Haram near ancient Arsuf making it possible to take the Ottoman positions in enfilade. The attack was carried out by infantry from the 232nd Brigade and 234th Brigade of the 75th Division and the 162nd Brigade of the 54th (East Anglian) Division closely supported by artillery in a creeping barrage. One section followed close behind the infantry leaving the rest of the battery in action and as