In this alternate timeline, the Central Powers had a more succesful 1915, starting with a more comprehensive victory at the econd Batle of Ypres, continuing with the Gorlice-Tarnow Offensive (especially at Jaslo and Rzeszow) and finally a more decicise Serbian Campaign.
For 1916 Germany believes that Russia can be knocked out and therefore adopts a defensive strategy in the West. Over the winter of 1915–16, the German Second and Seventh Armies construct a new fortified defensive system, the "Somme-Stellung", running roughly west of Bapaume and then south toward St-Quentin and Laon. Forward positions on the front line are held lightly and designed for elastic defense and a fighting withdrawal.
The Entente launches its major offensive in July 1916, on a broader front than historically. The British Third and Fourth Armies attack between Gommecourt and the Albert–Bapaume road. The French Sixth Army attacks strongly south of the Somme. The French Tenth Army opens a parallel offensive from the direction of Compiègne and Soissons, exploiting the absence of Verdun and France’s greater available strength.
The opening attacks achieve deeper gains than in real history. German forward zones fall back under pressure, inflicting casualties but avoiding encirclement. By mid-August, the Entente has seized much of the German first and second positions.
Through August and early September, the German command conducts a controlled withdrawal. Finally, the Péronne bridgehead becomes untenable.
By late September, German forces evacuate Péronne, demolishing the bridges and withdrawing behind the Somme-Stellung. The Entente tries to exploit the withdrawal, but the new German line—built on reverse slopes, with deep dugouts and integrated artillery zones—proves far harder to penetrate.
Franco-British forces reach but cannot break the new German positions before autumn rains set in.
By mid-October 1916, the offensive ends. The Entente has achieved large territorial gains—more than in the historical Somme—yet the German army has preserved its structure and manpower by trading ground for strategic freedom in the East.
The 1916 Somme offensive is viewed as a partial Entente success. Significant ground is gained (Péronne, the Oise line, much of the old German first and second positions). There is no decisive breakthrough, as the Somme-Stellung holds. German losses are lower than in the real 1916 campaign thanks to the early implementation of elastic defense. French morale is still higher without Verdun draining resources, despite heavy casualties to retake the Somme region.
It sets up a frustrating stalemate, with the Entente planning an even larger 1917 offensive and Germany completing its decisive operations against Russia on the Eastern Front.
