All these three or four major wars took place during the time of the three Avatars who had come to establish dharma consistent with the dawn of a new age. Therefore these wars can very well be seen as the last ditch attempt for the forces of adharma to resist the new age being ushered by the Avatar. Therefore each war has a spiritual as well as physical turning point.
The spiritual turning point is when the forces of adharma took an extreme step that invited a strong recoil as well as a Divine Intervention. Such a point for the Ramayana war that