The River Medway is a river in South East England, rising in the High Weald of Sussex and flowing through Kent and emptying into the River Thames estuary at Sheerness. The Medway Valley was a hub of Celtic settlement during the Iron Age, but, during the Roman conquest of Britain, the Romans defeated the native Britons at the Battle of the Medway in 43 AD and went on to establish several villas along the river. The Jutes left several burial sites along the river amid the Anglo-Saxon settlement of Britain, and the Normans built many manors and castles along the river following the Norman conquest of England. In 1667, a Dutch fleet invaded English territorial waters in the daring Raid on the Medway, a demoralizing defeat for England amid the Anglo-Dutch Wars. From 1824 to 1934, the Thames and Medway Canal was in use, but it was not a commercial success and was eventually replaced by a railroad. Since 604 AD, the Medway has divided the "Kentish Men" on the northwestern side of the river from the "Men of Kent" on the southeastern side.