Mahara Viking sun fara kai wa Daular Faransa hari a shekara ta 799, wanda ya sa Charlemagne ya samar da tsarin tsaro a gabar tekun arewa a shekara ta 810. Tsarin tsaro ya dakile wani harin Viking a bakin Seine a 820 (bayan mutuwar Charlemagne) amma ya kasa yin nasara. rike da sabon harin Danish Vikings a Frisia da Dorestad a cikin 834. Kamar sauran al'ummomi da ke kusa da Franks, Danes sun kasance da masaniya game da yanayin siyasa a Faransa a cikin 830s da farkon 840s sun yi amfani da yakin basasa na Frankish.An kai manyan hare-hare a Antwerp da Noirmoutier a 836, a Rouen (a kan Seine) a 841 da Quentovic da Nantes a 842.Sifen da aka yi wabirnin Paris na shekara ta 845 shi ne ƙarshen mamayar Viking a yammacin Faransa.Wani jigon Norse mai suna "Reginherus" ko Ragnar ne ya jagoranci sojojin Viking, wanda a zahiri an gano shi da halin saga na almara Ragnar Lodbrok.Rundunar Reginherus na jiragen ruwa 120 Viking, dauke da dubban mutane, sun shiga Seine a watan Maris kuma suka haye kogin.Sarkin Faransa Charles the Bald ya tara wasu ƙananan sojoji don mayar da martani amma bayan Vikings sun ci kashi ɗaya, wanda ya ƙunshi rabin sojojin, sauran dakarun sun ja da baya.Vikings sun isa Paris a ƙarshen wata, lokacin Ista.Sun yi wa ganima tare da mamaye birnin, inda suka janye bayan Charles the Bald ya biya kudin fansa na Faransawa 7,000 na zinari da azurfa.