Afterwards, the 2nd Lancers (10th Cavalry Brigade) led by the 11th Light Armoured Motor Battery, entered the Musmus Pass and crossed the Mount Carmel Range to El Lejjun during the night of 19/20 September. They continued their advance in the early morning of 20 September, to capture Afulah, in the center of the Plain. Leaving the 5th Cavalry Division to garrison Afulah, the 4th Cavalry Division continued their advance eastwards in the afternoon to capture Beisan, having ridden in 36 hours. The 19th Lancers (12th Cavalry Brigade) advanced directly from Afulah to the north east to capture the Jisr Mejamieh bridge across the Jordan River to the north of Beisan. On 20 September Allenby wrote: An aerial reconnaissance reported a gap of about of unguarded Jordan River crossings, north from the Jisr ed Damieh bridge. This bridge had been captured on the morning of 22 September by Chaytor's Force before it turned east to capture Es Salt and capture Amman during the Second Battle of Amman. Chauvel ordered Barrow's 4th Cavalry Division at Beisan to advance southwards along the banks of the Jordan River on 23 September to cut this line of retreat. The encirclement of what remained of the Seventh and Eighth Armies, still west of the Jordan River in the Judean Hills, was complete on 25 September. The Australian Mounted Division followed the 4th Cavalry Division through the Musmus Pass to Lejjun. The 3rd Light Horse Brigade was ordered to attack and capture Jenin and to cut the Nablus to Nazareth road, while the 4th Light Horse Brigade's 4th Light Horse Regiment guarded Desert Mounted Corps' headquarters, the 11th and 12th Light Horse Regiments were deployed to escort artillery and transport columns. The cavalry were required to garrison the captured positions, many miles from base. Here they would be dependent on rations for the three cavalry divisions, being quickly and efficiently transported forward, along their extended supply lines. Leaving the 8th Light Horse Regiment at Lejjun, the 9th and 10th Light Horse Regiments (3rd Light Horse Brigade) approached Jenin from two different directions, before charging into the town. After a two-hour-long battle the town along with the main line of retreat out of the Judean Hills were captured. Jenin had also been the main supply and ordnance depot for the Ottoman Seventh and Eighth Armies.