They didn’t get involved or even concern themselves with politics or defending their country either. Nor did any of them any longer establish businesses or be gainfully imployed.
Bu it's one that didn't persist for 300 years. It was almost univerally rejected by Christians, except for monastics.
The rejection of the sword for defense, however, did persist in the Christian community for 300 years, until the Age of Constantine. And after 300 years, too, by monastics.