disposal of the Minister of Defense and its first echelon was alerted in the 8th Military Region. Under the mobilization plan it was located in the area of Gray, under the command of Général de division Henri Parisot from 2 September. The second echelon arrived on 26 August, when the division was assigned to the covering reserve in the 8th Army sector. On 5 September it was transferred by road to the area southwest of Sarrebourg, with headquarters in Blamont as part of the 5th Army. Three days later the division headquarters relocated east to Lemberg when it became part of the 8th Army Corps of the 5th Army. Between 9 and 12 September the division advanced into the Ohrenthal (part of Rolbing) salient with the 23rd Infantry Division of the 5th Army Corps of the 4th Army on the left and the 4th Colonial Infantry Division of its corps on the right in front of the Maginot Line as part of the Saar Offensive, with its headquarters at Schorbach. This advance, which became known as the Saar Offensive, resulted in the division occupying positions from the German border at Hornbach to the outskirts of Stausteinerwald, west of the Fortified Sector of Rohrbach, on 13 September. As the French units began retreating towards the Maginot Line, the division sector was modified to run from Height 326 west of Hornbach to Height 354 west of Riedelberg between 24 and 25 September. Relieved by the 35th Infantry Division in its left sector and the 3rd Colonial Infantry Division in its right sector between 2 and 3 October, the division retreated behind the Maginot Line. It reconcentrated in the area of Baerenthal on 4 October. Transferred to the 5th Army reserve with headquarters at Bouxwiller on 9 October, the 15e DIM moved by road to the area of Sarrebourg and Cirey on the next day, where it became part of the reserve of the 2nd Army Group with headquarters at the latter. It was further moved by rail and road to the area of Chauny, Guiscard, Ham, and Coucy for rest, reorganization, and training on 23 October. There, it was placed in the reserve of the Grand Quartier Général while headquartered at Chauny, where it spent the rest of the Phoney War. Général de division Alphonse Juin became division commander on 1 December. Battle of Belgium When the German invasion of Belgium began