Battle of the Medway
43 CE.
Shown on the map at 51.440°, 0.742°.
The Battle of the Medway took place in 43 AD, probably on the River Medway in the lands of the Iron Age tribe of the Cantiaci, now the English county of Kent. This was an early battle in the Claudian invasion of Britain, led by Aulus Plautius.
Text from the Wikipedia article Battle of the Medway, licensed CC BY-SA 4.0.