 Complete the following phrase:  After concentrating on Lemnos, the regiment sailed back to Egypt on the transport Ionian on 22 December, spending Christmas at sea. On 27 December, the regiment made port at Alexandria and established a camp at Heliopolis. Back in Egypt the regiment, still with the 1st Light Horse Brigade, became part of the ANZAC Mounted Division, responsible for the defence of the Suez Canal from raiding Senussi Arabs. Then on 4 August 1916, they fought in the Battle of Romani against the Turks, before being withdrawn to rest and refit. The regiment rejoined the brigade in November and took part in the battles of Maghaba and 