By December 1916, construction of the infrastructure and supply lines had sufficiently progressed to enable the British advance to recommence, during the evening of 20 December. By the following morning a mounted force had reached El Arish to find it abandoned. An Ottoman Army garrison in a strong defensive position was located at Magdhaba, some inland to the south east, on the Wadi el Arish. After a second night march by the Anzac Mounted Division (Australian and New Zealand Mounted Division), the attack on Magdhaba was launched by Australian, British and New Zealand troops against well-entrenched Ottoman forces defending a series of six redoubts. During the day's fierce fighting, the mounted infantry tactics of riding as close to the front line as possible and then dismounting to make their attack with the bayonet supported by artillery and machine guns prevailed, assisted by aircraft reconnaissances. All of the well-camouflaged redoubts were eventually located and captured and the Ottoman defenders surrendered in the late afternoon.