The Germans around Verdun in 1915/6 were attacking on limited fronts with infiltration type tactics and lots of artillery, pioneered by
General Karl Bruno Julius von Mudra, in the Argonne. Infantry had automatic weapons, mortars, flamethrowers and satchels of grenades and advanced in small groups after hurricane bombardments. They did not use human wave tactics after 1870. Units on occasion got ambushed or new commanders messed up (the new reserve corps around ypers). These tactics were not properly used during the "Verdun"offensive, so German losses were 2 for every 3 French losses, vs the 1 for 4 or 5 French losses typical of von Mudra attacks. His early attacks used 76 77mm, 26 105mm, later he was given 16 150mm guns, 10 210mm and another 10 of larger sizes along with 40 heavy and medium Minenwerfer. Each attack was brigade sized and only targeted a few thousand meters of front. The next attack had 20 more 210mm howitzers and 36,000 hand grenades on a 2 kilometer front.
French Deputy Abel Ferry estimated the French lost 80,000 men in the Argonne in 1915, the German losses were about 1/4 of that. 1915 Allies had 390,000 killed in Flanders and France. German losses were 114,000.
Human waves were a Anglo/French thing until after the Nevelle offensive. The French from 1915 used more guns and less bodies. The Germans had lots of Howitzers at the division (36 105mm per active division 1,872+ 105mm)/Active Corps level (368 150mm) and higher (96 210mm, 2 420mm, 5 305mm) and added more, the allies had a severe shortage of them until 1917 on. France started the war with 308 120mm and 155mm guns and howitzers.
At the day to day level the Germans had a big advantage in indirect fire weapons.
German Active Corps
72 105mm howitzers
16 150mm howitzers
French Active Corps
0 howitzers.