 As part of the second wave , the 2nd Brigade had been landing since 05 : 30 ; the 5th , 6th and 8th Battalions were supposed to cross 400 Plateau and head to Hill 971 , while the 7th Battalion on the left were to climb Plugge 's Plateau then make for Hill 971 . One 7th Battalion company , Jackson 's , landed beside the Fisherman 's Hut in the north and was almost wiped out ; only forty men survived the landing . At 06 : 00 Major <unk> <unk> 's 7th Battalion company , and part of another , were sent onto 400 Plateau by Maclagen to strengthen the defence . When the 7th Battalion commander Lieutenant @-@ Colonel Harold Elliott landed he realised events were not going to plan , and he headed to the 3rd Brigade headquarters to find out what was happening . Maclagen ordered him to gather his battalion at the south of the beachhead , as the 2nd Brigade would now form the division 's right flank , not left . When the 2nd Brigade commander Colonel James McCay arrived Maclagen convinced him to move his brigade to the south , <unk> responsibility with the 3rd Brigade . Eventually agreeing , he established his headquarters on the seaward slope of 400 Plateau ( McCay 's Hill ) . Heading onto the plateau , McCay realised the ridge to his right , Bolton 's Ridge , would be a key point in their defence . He located the Brigade @-@ Major , Walter Cass , and ordered him to gather what men he could to defend the ridge . Looking around , he saw the 8th Battalion , commanded by Colonel William Bolton , moving forward , so Cass directed them to Bolton 's Ridge . As such , it was the only ANZAC battalion that remained together during the day . Eventually , around 07 : 00 , the rest of the brigade started arriving . As each company and battalion appeared they were pushed forward into the front line , but with no defined orders other than to support the 3rd Brigade . At 10 : 30 the six guns of the 26th <unk> Mountain Battery arrived , positioning three guns each side of White 's Valley . At noon they opened fire on the Turks on Gun Ridge . 
