Conflict is distributed across the houses in a way that repays attention, because the tradition distinguishes kinds of enemy that a single English word does not.
The seventh house holds the open enemy, and holds them in the same place as the spouse, the business partner and the other party to a lawsuit. What these have in common is that the other person is declared. A seventh house enemy is someone the native can name, meet and answer, and a suit at law is the most formal version of that relation.
The twelfth holds the enemy who is not declared: secret enemies, treachery, imprisonment, and in Lilly's list, self undoing. Saturn has its joy there. The twelfth is the house of what works against the native out of sight, including what the native does to themselves, and the tradition treats an unrecognised opponent as a different order of problem from a recognised one.
Between them sits the practical question any horary on a quarrel has to answer first, which is which house this is. A reading that puts a hidden enemy in the seventh will spend its time waiting for a confrontation that never arrives.
Mundane astrology, which reads charts for nations rather than people, uses the same distinctions at scale, taking Mars for war and the seventh house of a national chart for declared foreign enemies. The atlas records the technique. It makes no claim that any chart has ever predicted a war.