Richborough WW1 Detention Cells, Richborough, Kent.
"During the First World War 1914/18 a secret "Q" port by the banks of the River Stour was the starting point of a ferry service for troops and munitions to France and Flanders. Camps were occupied by thousands of soldiers who were taken by day or by night across the North Sea and the Channel to Dunkirk and Calais.
The chosen spot for the hidden port was under the Roman fortress of Richborough; and a railway was constructed from the main line which passes under the Saxon walls to the banks of the Stour. The river mouth was dredged; and a new port of embarkation was created. The camp was constructed in the marshlands on both sides of the river, with the detention cells being built for obvious reasons.
Most of the work undertaken by the Royal Engineers and much of the equipment and arms for the Ypres Salient were sent across from Richborough Port, using sea going barges and the very first roll-on roll-off ferries."