BibTeX:
@incollection{Various,
  author = {Various},
  title = {Think, for example, how the enemy had completely hemmed in the Fort},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/courage},
}

APA:
Various. Think, for example, how the enemy had completely hemmed in the Fort. In *bahaistories.com archive*.

MLA:
Various. "Think, for example, how the enemy had completely hemmed in the Fort." *bahaistories.com archive*, n.d..

Chicago:
Various. "Think, for example, how the enemy had completely hemmed in the Fort." In *bahaistories.com archive*, n.d..