'The war of national defense on the southwestern border of Vietnam 40 years ago (1977-1979) was one of the great wars of Vietnam in the history of fighting against foreign aggression in the 20th century. In fact, this war has not been properly and correctly perceived both domestically and internationally, not yet fully documented in history books, not yet included in history textbooks in high schools. This book gathers all the articles of researchers on this topic. The content of the book consists of 4 main parts: Part 1 - Background and the cause of the war; Part 2 - Evolution of the war; Part 3 - Results, implications and effects of the Southwest border defense war; Part 4 - Identification and retention.