The site of the Claudian invasion of Britain in AD 43 has been a matter of academic debate. Although it is generally believed that the force left from Gesoriacum (Boulogne), it is possible that part of the fleet sailed from near the mouth of the Rhine. Rutupiæ has earthworks that defended a bridgehead dating from this period and is often stated as the site of the landing, though there are plausible arguments in favour of a landing further west along the south coast of Britain.