In the tenth month of the second year of Kōan (1279), this letter was written in reply to a letter to Nichiren Daishonin from Shijō Kingo, informing him that Kingo had been ambushed by enemies among his fellow samurai, but had managed to escape unharmed.
The Daishonin teaches Kingo that faith must always come first, before any other tactic or strategy, and that faith in the Mystic Law is the ultimate factor that determines victory or defeat.
https://www.nichirenlibrary.org/en/wnd-1/Content/139