It seems odd that in the middle of total war between the Allies and Nazi Germany, that such formalities as exchanging badly wounded prisoners-of-war were not only negotiated but carried out. British Merchant Marine officer Peter Guy, cited in Convoy: Merchant Sailors At War 1939-1945 by P. Kaplan and J. Currie (4 stars), describes an exchange which occurred in the late December of 1944.
He is aboard the British merchant ship Arundel Castle and their destination is Goteborg, in neutral Sweden where the exchange will take place.
We were granted safe passage, and it was a treat to have portholes open and lights showing. On Christmas Eve 1944, we lay off Gibraltar after embarking the Germans at Marseilles, and everyone who was able gathered on the deck to sing a grand selection of carols….Later we passed through a narrow channel in the Skaggerak into the Baltic, and we could see the faces of the German gunners looking down on us from their gun positions. They weren’t impressed when some of our crew gave the V-sign. Arriving at Goteborg, we were surprised to get a welcome from a German brass band playing on the quayside…The saddest part was when close on a hundred of our lads who had lost their sight were led up the gangway. The exchange was all over in about three hours and we sailed home to Liverpool.
It is important to note that both Norway and Denmark were occupied by the Germans at this time so the German gunners he refers to are stationed in those countries.
[Images courtesy of Wikimedia and Naval-History.net.]