 From 6 to 29 December 1915 he was acting commander of the 1st Light Horse Brigade.The 1st Light Horse regiment arrived back in Alexandria on 27 December 1915 and on 14 January 1916 was ordered to join the Western Frontier Force, defending the Sudan against the Senussi.On 5 May, Meredith once again took over command of the 1st Light Horse Brigade when Brigadier General Charles Cox went to England on sick leave, holding the rank of colonel while in command of the brigade.