As the German army stormed through France in June 1940, some 30,000 Channel Islanders (one third of the total population) were evacuated. Once the initial panic was over, the rest decided to stay and tough it out, mainly on Jersey and Guernsey.
On 28 June, the Luftwaffe bombed Jersey and Guernsey, unaware that the islands were undefended. They killed 44 people. Two days later, Luftwaffe personnel took control of Guernsey airfield. There they met the chief of police, who informed them that the islands were undefended.
The following day, a detachment of troops arrived on Guernsey and that afternoon the German flag was raised. More arrived later and their attention turned to the other islands.
Guernsey Issues 1941-1944.
Guernsey included the islands of Alderney, Herm, Jethou and Sark. The following issue was designed by E.W.Vaudin and printed by the "Guernsey Press Co. Ltd".
During this time existing British stamps continued in use and are known mixed on covers.
First Jersey Issue 1941-1942.
Jersey included the islands of Les Dirouilles, Les Ecrehous and Les Minquiers. The first issue was designed by N.V.L.Rybot and printed by the Jersey Evening Post.
Second Jersey Issue 1943.
In June 1943 it was decided to print a scenic set of six stamps for Jersey, they were designed by E.Blampied and printed by H.Cortot. The stamps were printed by the French State Printing Works in Paris and shipped back to the island.
In 1940 the German authorities were content to allow the further use of British stamps, but with the post offices on the Channel Islands now cut off from the British mainland, it was only a question of time before supplies of stamps ran low.
The most common stamp in use was the 1 penny stamp and it was this one that ran out first. The authorities issued permission for twopenny stamps to be used cut in half, or in philatelic terms, bicected. This was authorized originally for Guernsey only, but bicects were soon seen in Jersey as well.
The most common bisect was the twopenny orange from January 1938, if you see a twopenney pale orange, it is not an original WW2 bisect as this shade was not issued until 1941/42 and was not known used in the Channel Islands.
The second bisect was the twopenny stamp from the "Centenary of First Postage Stamps" (issued 6th May 1940), they made their way to the Islands seven weeks before the occupation.
Much more rare are the King George V and the King Edward VIII stamps which were also bisected, these come from stamp collectors resident on the Islands during the occupation.
The British liberated the islands on 9 May 1945.