The war memorial for the fallen of the First World War from Kastel consists of an avenue, on the sides of which 10 smaller gravestones mark the resting places of individual soldiers. Their 243 names, together with the place and date of their death, are inscribed on six larger stone plaques. The avenue leads up to the actual memorial.

It shows a seated male figure on a pedestal, holding a knee with his right arm, on which he has rested his head; with both hands he holds a sword stuck in the pedestal. The figure lacks anything heroic; his posture is that of a mourner. The front of the plinth bears the inscription: "1914/18 In memory of our victims. 1933/1945". On the back is the information: "Built in 1931 by the citizens of Mainz-Kastel".

The war memorial was erected shortly after the end of the British occupation; the text was added after the Second World War. In the immediate vicinity there are memorials and gravestones for the Kastel victims of the Second World War, the Franco-Prussian War of 1870/71 and the Napoleonic Wars of 1812/13.