how many was the 18th prussian army generals?

The 18th Army of Prussia, which was formed during World War I, had several generals commanding various divisions and units within the army. The exact number of generals can vary depending on the specific formations and reorganization throughout the war. If you are referring to a specific commanding general of the 18th Army, it was primarily led by General Otto von Below. For a more detailed account of all the generals who served under the 18th Army or during its deployments, you might need to refer to specific historical records or military archives. If you need more detailed information or specifics about a particular aspect of the 18th Army, feel free to ask!