To have recourse to
1. To retreat for safety to (a stronger position in the rear, as to a fort or a supporting body of troops).
2. To have recourse to (a reserved fund, or some available expedient or support).
1. When you return to a place where you were before, you go back or go back to that place.
2. When a condition, problem, practice, or custom goes back to a certain time, it began at that time.
3. When you are discussing the age of something, you go back or go back to when it was created or started.