Question: When did the raid on the Channel ports actually happen?
About the article "Battle of Britain", section "Bomber and Coastal Command contributions".

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Several films have focused on the raid, while also including archival footage of the POWs.
Edward Dmytryk's 1945 film "Back to Bataan", starring John Wayne, opens by retelling the story of the raid on the Cabanatuan POW camp.
Based on the books "The Great Raid on Cabanatuan" and "Ghost Soldiers", the 2005 John Dahl film "The Great Raid" focused on the raid intertwined with a love story.
Prince served as a consultant on the film, and believed it depicted the raid accurately.
Marty Katz conveyed his interest in producing the film: "This was a massive operation that had very little chance of success.
It's like a Hollywood movie—it couldn't really happen, but it did.
That was why we were attracted to the material."
On 6 August 1914 the German Zeppelin L 6 bombed the Belgian city of Liège, killing nine civilians.
This was followed by night raids on Antwerp on 25 August and 2 September.
In the first month of the war Germany formed the "Ostend Carrier Pigeon Detachment", a cover name for an aeroplane unit to be used for the bombing of the English Channel ports.
During the opening months of the war a German pilot flying a Taube regularly dropped bombs on Paris.
The first raid consisted of five small bombs and a note demanding the immediate surrender of Paris and the French nation.
Before the stabilisation of the Western Front, German aircraft made a number of raids on Paris, slightly damaging Notre Dame Cathedral.
The first German bombing raids on England were nuisance raids carried out against Channel ports.
German press reports mention a raid carried out on 27 October, but there is no British record of any incident on this date.
The first confirmed raid occurred on 21 December, when a Friedrichshafen FF.29 dropped two bombs into the sea near the Admiralty Pier in Dover.
These raids, usually carried out by one or two aircraft during daytime, continued throughout the war, with little effect. 
The Second Ostend Raid (officially known as Operation VS) was the later of two failed attempts made during the spring of 1918 by the United Kingdom's Royal Navy to block the channels leading to the Belgian port of Ostend as a part of its conflict with the German Empire during World War I.
The German Navy had used the port since 1915 as a base for their U-boat activities during the battle of the Atlantic and the strategic advantages conferred by the Belgian ports in the conflict were very important.
A successful blockade of these bases would force German submarines to operate out of more distant ports, such as Wilhelmshaven, on the German coast.
This would expose them for longer to Allied countermeasures and reduce the time they could spend raiding.
The ports of Ostend and Zeebrugge (which had been partially blocked in the Zeebrugge Raid three weeks previously) provided sea access via canals for the major inland port of Bruges.
Bruges was used as a base for small warships and submarines.
As it was inland, it was immune to most naval artillery fire and coastal raids, providing a safe harbour for training and repair.
The Ostend Raid was largely a failure as a result of heavy German resistance and British navigational difficulties in poor weather.
In anticipation of a raid, the Germans had removed the navigation buoys and without them the British had difficulty finding the narrow channel into the harbour in poor weather.
When they did discover the entrance, German resistance proved too strong for the operation to be completed as originally planned: the obsolete cruiser HMS "Vindictive" was sunk, but only partially blocked the channel.
Despite its failure, the raid was presented in Britain as a courageous and daring gamble which came very close to success.
Three Victoria Crosses and numerous other gallantry medals were awarded to sailors who participated in the operation.
British forces had moderate casualties in the raid, compared to minimal German losses.