In 1879, during the Anglo-Zulu War, man-of-the-people Lt. Chard and snooty Lt. Bromhead are in charge of defending the isolated and vastly outnumbered Natal outpost of Rorke's Drift from tribal hordes.

Defiant's crew is part of a fleet-wide movement to present a petition of grievances to the Admiralty. Violence must be no part of it. The continual sadism of Defiant's first officer makes this difficult, and when the captain is disabled, the chance for violence increases.