In September the division moved to the Ypres Salient to take part in its first full-scale action, the 3rd Ypres Offensive. The 59th relieved the 55th (West Lancashire) Division after its successful attack at the Battle of the Menin Road Ridge, and then took the lead in the next phase, the Battle of Polygon Wood (26 September). This was equally successful, with the Leicester battalions of 177th Bde advancing behind the smoke and dust of a creeping barrage and gaining their first objective without much opposition. The two Lincolnshire battalions then passed through to take the second objective, 2/5th Lincolns attacking with B company on the right, D on the left, C in support and A in reserve providing carrying parties. D Company met practically no resistance and dug a strongpoint north of 'Dochy Farm'. B Company attacked the farm, meeting machine gun and rifle fire, but worked round the flanks of the pillboxes with the help of a platoon from B Company, whereupon some 50 Germans surrendered to them. The battalion then consolidated a line of strongpoints, and deepened and connected a line of shell holes in rear of the strongpoints. German shellfire caused only a few casualties and the battalion was relieved that night. Although the attack had been a complete success, the battalion still suffered 16 killed, 210 wounded and 74 missing; of 584 officers and men who went into action, only 285 marched out.