In September 1940, the 5th Indian Infantry Division (Major-General Lewis Heath) began to arrive in Sudan; Platt held back the 29th Indian Infantry Brigade (Brigadier John Marriott) around Port Sudan and the rest, with attachments from the SDF, was ordered to prevent an Italian advance on Khartoum, from Goz Regeb on the Atbara River to Gallabat, a front of about 200 miles .