Babylon 5: "In the Beginning"
Babylon 5: In the Beginning (USA working title, Babylon 5: "Last of the Fallen"). Michael Vejar, director. J. Michael Straczynski, script. TV movie, released USA 4 January 1998. 94 minutes.  Flashback to start of story, used as opening for Season 5.
Covered briefly in Frank Garcia's "Babylon 5 Episode Guide," Cinefantastique 31.12/Vol. 32 No. 1 (June 2000): 100-01. See Babylon 5 entry for link to locations on line where the relevant Cinefantastique issues are likely to be archived. Discussed in more detail in the entry on the Babylon 5 fandom wiki and in the Wikipedia entry.
See for images of future/futuristic military hardware and an instructive bit of play with the meaning among space navies of open gunports on spaceships.
RDE, finishing, 8Sep22