By way of reprisals for the continued attacks on Luneville and Compiegne by German aviators, a squadron of French aeroplanes flew over the German town of Trier (Treves) on September 13, 1915, and deposited one hundred bombs. After returning to the base and taking on board further supplies, they set out again in the afternoon and dropped fifty-eight shells on the station of Dommary Baroncourt. Other aeros bombarded the railway stations at Donaueschingen on the Danube and at Marbach, where movements of troops had been reported. Activity grew in intensity all along the front. Artillery fighting on the Yser, the north and south of Arras, in the sectors of Neuville, Roclincourt and Mailly. To the north of the Oise the French artillery carried out a destructive fire on the German defenses and the works of Beuvraignes. Infantry attacks occurred in front of Andrechy. On the canal from the Aisne to the Marne the French bombarded the trenches, batteries and cantonments of the Germans in the environs of Sapigneul and of Neuville, near Berry-au-Bac. Grenade engagements took place near the Bethune-Arras road and north of Souchez. South of the Somme, before Fay, there were constant and stubborn mine duels, while fierce bombardments in the sectors of Armancourt (southwest of Compiegne), Beuvraignes (south of Roye), as well as on the plateau of. Quennevieres (northeast of Compiegne) and Nouvron (northwest of Soissons), continued uninterruptedly. In Champagne and in the Argonne also, long range artillery fighting rent the air. On the Lorraine front, in the environs of Embermenil, Leintrey, and Ancerviller, near Luneville, the German trenches and works were subjected to heavy fire. Poison shells and liquid fire played an important part in the furious fighting that was gradually developing in the Vosges, and assisted the Germans to gain some initial successes. On the Lingekopf-Barrenkopf front the French were driven out of a first-line trench on the Schratzmannele, but they recovered most of the ground by a counterattack. Similarly on the summit of the Hartmannsweilerkopf, where the Germans had also obtained a footing in the French trenches, they were subsequently ejected again. These trenches had been captured with the aid of blazing liquids. Our first knowledge of this "blazing liquid" (outside of Germany) was derived from a document which fell into French hands early in the war. It was Note 32 of the Second Army, dated October 16, 1914, at St. Quentin. In it were published the following instructions under the heading of "Arms at the disposal of Pioneers (Sappers) for fighting at close quarters":