This actually happened to my father, who is sadly now deceased, but it was so extraordinary that I thought I'd like to tell you about it. He was in the RAF during the Second World War and was posted to India. After his arrival there he moved around a lot, so had no contact with his family back in S. Wales for about 8 months. Eventually he was in Ceylon for a short break, and while there the mail caught up with him. On the last day he was stationed in Ceylon, he was sitting on the edge of the parade ground reading his post, while a party of recently arrived soldiers were parading.