First Battle of the Aisne

The First Battle of the Aisne (French: 1ère Bataille de l'Aisne) was the Allied follow-up offensive against the right wing of the German First Army (led by Alexander von Kluck) and the Second Army (led by Karl von Bülow) as they retreated after the First Battle of the Marne earlier in September 1914. The Advance to the Aisne (6 September – 1 October) consisted of the Battle of the Marne (7–10 September) and the Battle of the Aisne (12–15 September).

Source: Wikipedia — First Battle of the Aisne (CC BY-SA 4.0)