Which is the relationship between defense policy and foreign policy? How does defense policy influence foreign policy? The investigation is based on both questions. After a review of Argentinian literature analyzing the link between these policies, the article presents a new way of approaching the relationship between national defense and foreign policy based on the geopolitical concept of “axial point”. In this sense, the research suggests that, unlike traditional interpretations that place national defense as a secondary and complementary sphere to foreign policy, it is possible to argue that the former has a strong impact and influence on the latter. To empirically illustrate this new way of seeing the relationship between both policies, the article analyzes –using qualitative methodology linked to a single case study and based on the analysis of official documents and literature from that period– the bilateral relationship between Argentina and Chile, taking as central point of the analysis the Beagle Channel Conflict and considering the channel as an axial point. The paper concludes by showing how the case study illustrates the way in which defense policy impacts and influences foreign policy.