The Channel Islands were the only part of the Britain Isles to be occupied by German forces in WW2. The five-year occupation came to an end on 9 May 1945.
The German Occupation of Jersey began one week after the British government had demilitarized the island fearing for the safety of civilians should there be any conflict. The codename for this was “Operation Green Arrow” and the initial German Air Force reconnaissance flights mistake civilian farming lorries for troop carriers. On the 28th of June , the German Air Force, not knowing of the demilitarization, bomb and machine gun multiple sites on the island. The attacks killed ten people and wound many more. A few days later on the 1 of July 1940 General Richthofen, The Commander of the German Air Forces in Normandy, dropped an ultimatum from the air demanding the immediate surrender of the island. White flags and crosses were placed in prominent positions, as stipulated by the Germans, and later that day Jersey was occupied by air-borne troops under the command of Hauptmann Gussek.
https://www.jersey.com/discover-jerseys-occupation-story
At 7.15am on 9 May, on the quarter deck of HMS Bulldog, Second-in-Command for Guernsey General Siegfried Heine signed the Instrument of Surrender on behalf of the German Command of the Channel Islands, effecting their capitulation. On completion of this, General Heine was then ordered to “immediately cause all German flags and ensigns now flying in the Channel Islands to be lowered”. At Midday an overjoyed Bailiff Coutanche accompanied a German delegation led by the island Commander, General Major Rudolf Wulf, aboard HMS Beagle anchored in St. Aubin’s bay, where the separate surrender of Jersey was to take place. Arriving at the same time in St. Helier’s harbour was a small naval inspection party sent to report on the health of the islanders, who were promptly overwhelmed by an enthusiastic crowd delighted at seeing their first liberators landing on Jersey soil.