In this talk, I present a phenomenological account of war through Heidegger’s “Being and Time”. Rather than viewing war as a mere political instrument or military activity, I propose examining it as a distinct mode of being-in-the-world that profoundly transforms human existence. The presentation explores how war disrupts the ordinary world, alters the experience of time and space, affects the body through both action and suffering, and reshapes relationships, social roles, trust, identity, and values. I argue that understanding war requires attention not only to how humans produce it, but also to how war acts back upon individuals and communities.