The book once again analyzes and clarifies the lesson of combining national strength with the strength of the times that made the victory of the resistance war against the French colonialists as well as all victories of the Vietnamese revolution. In the period from 1946-1954, people-to-people diplomacy contributed mainly to opening up international contacts when our country was isolated from the outside. Vietnam's people's organizations (trade unions, women, youth, etc.) send many delegations to international campaigns to enlist the world's support for the resistance war, and at the same time contribute to the struggle of the world's people against war and protection of peace.