This article includes a list of general references, but it lacks sufficient corresponding inline citations. (January 2021) |
Plan R 4 was an unrealised British plan to invade Norway and Sweden in April 1940, during the Second World War. As a result of competing plans for Norway and a German invasion of Norway the same month, it was not carried out as designed. Similar plans had been drawn up during the proposed Anglo-French intervention in the Winter War.