Nowaday, "The silver-headed old soldier" can no longer tell the story of "Nguyen Phong" anymore, but there are still many memories evoked from the letters, the yellowed paper notebooks. The war against the French colonialists was told by the insider - Pham Hong Son - in the "Half-life of the battle", the memory of the memory stopped on May 7, 1954. However, if only counting to that day, the last day of Dien Bien Campaign, there are still unused documents. For example, a letter written on the campaign end date. It was itself a rare artifact: letters written on pelure paper, spoils taken at De Castries' basement. Then the date written on the letter is also meaningful: 5 pm May 7, 1954. These precious documents will be collected in the precious publication "Remember and Forget" - Author: Pham Hong Son - Dang Anh Dao, published on the 65th anniversary of the victory of Dien Bien Phu: May 7, 1954 - May 7, 2019.