That the German Empire was built on war and destruction and intent on war and destruction.
The poster in which that image was featured was a French propaganda poster from around 1915. The main image in the poster was of the god Thor, portrayed in demonic appearance. The main caption read, "La Dieu Thor, la plus barbare de'entre les barbares divinites de la Vieilla Germanie" -- The god Thor, the most barbaric of the barbarian divinities of Old Germany.