On 12 to 15 March 1918, JG III's aircraft would be hidden near the front lines awaiting the Spring Offensive. On 21 March, the wing cleared the sky of opposing aircraft, to begin their support of Operation Michael. Subsequent to this, the wing would fight in the Battle of the Lys, the Third Battle of the Aisne, and the Second Battle of the Marne offensives. When the Allied Hundred Days Offensive began on 8 August, JG III was still in the fight. Despite increasing shortages of supplies, aircraft, and pilots, along with frequent changes of airfields during withdrawals, the wing had its most successful month of the war in September. On 2 September, JG III shot down 26 enemy aircraft, for the best day's performance of any German wing in World War I. However, by October, the Allied air forces—which now included fresh American units—were numerous enough to overwhelm German defenses.