In the northern defence zone, the 27th Regiment commander Lieutenant-Colonel Ali Chefik Bey put the 2nd Battalion on the coast, with two 120 mm guns at Gaba Tepe and two 150 mm guns further inland; the 1st and 3rd battalions were held in reserve near Maidos (until bombed on 23 April, after which they were moved to an area within 1 miles of Gaba Tepe).