At 7 a.m. on 9 October, the Greek infantry began its assault on Sarandaporo. The 1st, 2nd and 3rd Divisions attacked the Ottoman main line frontally, their advance hampered by accurate Ottoman rifle and artillery fire and the ruggedness of the terrain. In the meantime, the 4th Division conducted a flanking maneuver from the west with the intention of occupying the Porta Pass, and striking the rear of the Ottoman positions.[14] The 5th Division advanced further to the west towards the village of Zampourda which was situated on the other bank of the Haliacmon, with the intention of protecting the left flank of the Greek forces emerging from the Sarandaporo pass.