Later in the year, the army was involved in the north of the Ailette and in October at the Battle of Malmaison. Max von Boehn celebrated on 5 December 1917 in Marle, his 50th military service anniversary. His king honored him with the award of the Grand "Order of the Red Eagle" with Oak Leaves and Swords. At the beginning of Spring Offensive or "Kaiserschlacht" in France, Boehn was promoted to Colonel General on 22 March 1918. During the German offensive, the army penetrated to the west but had ceased their advance on 6 April. On 27 May, he was able to proceed aggressively again, negotiating the Chemin des Dames, the Aisne-Marne Canal, the Aisne and the Vesle. Boehn further managed to conquer the forts on the West Front of Reims. Within days Boehn's units had achieved territorial gains of depth, captured 60,000 prisoners of war and seized 830 guns and 2,000 machine guns. For these achievements, Wilhelm II appointed him Chief of the Schleswig-Holstein Infantry Regiment No. 163 on 30 May 1918. Six days later, in Fressancourt, Boehn welcomed his regiment which had been transferred from the 4th to the 7th Army. Boehn was knighted and dubbed a Knight of the "Order of the Black Eagle". Assault warfare again switched to trench warfare. Boehn's army fought between the Oise, Aisne and Marne. A final assault battle of the Marne and in Champagne developed into a defensive battle, between Soissons and Reims and between Marne and Vesle. In the end the German troops were driven back to a line before the Spring Offensive. (Battle of the Marne)  On 6 August 1918 Boehn was appointed the Commander-in-Chief of the "Army Group Boehn" which was formed  on 12 August 1918 from the 2nd, 9th, and 18th armies to defend the Siegfried Line (Hindenburg Line) in the southern Artois between Oise and Somme. It was the last of its kind in this war. When the superiority of the Allies forced the surrender of the Army Group, it was dissolved on 8 October 1918. Boehn received at his request on 31 October 1918 the command of the 7th Army. After fighting in the Hunding and the Antwerp–Meuse position, the cease fire ending the war was proclaimed on 11 November 1918 at Compiègne.