A ranar 10 ga Mayu, 1848, shi da Karl Marx sun yi tafiya daga Cologne, Jamus, don lura da abubuwan da ke faruwa a yankin. Daga Yuni 1, 1848, Engels da Marx sun zama editocin Neue Rheinische Zeitung. Kasa da shekara guda bayan haka, a ranar 19 ga Mayu, 1849, hukumomin Prussian sun rufe jaridar saboda goyon bayanta ga gyare-gyaren tsarin mulki. Tambaya: A wace shekara ne Karl Marx ya yi tafiya tare da shi?
Shekara ta 1848