In January 1879, a harrowing communiqué reaches the government in London, narrated by Richard Burton, shedding light on the devastating defeat suffered by British forces at the Battle of Isandlwana on January 22, 1879. The film opens with a grand Zulu wedding ceremony, where Boer missionary Otto Witt (Jack Hawkins) and his daughter (Ulla Jacobsson) witness Zulu King Cetewayo, portrayed by Chief Mangosuthu Buthelezi, learning of the early triumph this same day.
Realizing the impending danger, Witt and his daughter escape the Zulu village in a rushed attempt to alert the British soldiers stationed at their mission in Rorke's Drift about the incoming Zulu onslaught. A company from the British Army’s 24th Regiment of Foot, hailing from Wales, has taken refuge at the missionary station, using it as a supply depot and hospital ahead of their campaign in Zululand.
Upon receiving the alarming news from the Witts about the looming Zulu forces, Lieutenant John Chard (Stanley Baker), of the Royal Engineers, steps up to lead the small contingent of 135 British troops. He takes command over Lieutenant Gonville Bromhead (Michael Caine), whose infantry background leads to tension between the two, especially since Bromhead is loathe to find himself subordinate to an engineer.
Guided by a Boer frontier police officer, Chard and Bromhead grasp the Zulu’s tactical doctrine, specifically the lethal Bull formation designed for a pincer movement. Recognizing that fleeing from the Zulu army is futile—particularly with many wounded soldiers—Chard opts instead to fortify their position, employing whatever materials they can find, including wagons, food sacks, and ship's biscuit crates.
As the situation becomes dire and Witt succumbs to drunkenness, his negative prophecies begin to demoralize the troops, resulting in the desertion of the Natal Native Contingent. In a desperate move, Chard orders Witt and his daughter to leave, allowing them to pass by a group of Zulu warriors who, perceiving them as missionaries, refrain from attacking.
With the Zulu forces drawing near, a contingent of Boer horsemen appears, cautioning Chard about the futility of their defense before abandoning him to his fate. Moments later, the air thickens with a thunderous sound—thousands of Zulu warriors banging their cowhide shields together, as Bromhead starkly notes, "it sounds like a train." The fierce 4,000-strong Zulu contingent soon materializes, poised to assault Rorke's Drift.
The onslaught begins, and a hail of gunfire erupts as hundreds of Zulu riflemen launch attacks from a neighboring hill. Over the course of several hours, the British soldiers repel relentless waves of attackers, yet the Zulus manage to ignite the hospital, triggering a brutal hand-to-hand combat scenario as British patients attempt to flee the flames. In a surprising turn, Private Henry Hook (James Booth) rises to the occasion, orchestrating a successful breakout amidst chaos. The fighting stretches into the lengthy night.
As dawn breaks, the Zulus draw closer, chanting a war song that echoes against the rising sun; the British forces respond defiantly with “Men of Harlech.” In the final push, as it seems the weary defenders will be overwhelmed, they regroup behind a small redoubt of mealie bags ordered by Chard. Concealed within this makeshift shelter, the soldiers unleash a ferocious volley against the surprised Zulu warriors, who retreat after suffering significant losses. In an unexpected act of respect, the Zulus later sing a song in tribute to the defenders’ valour as they withdraw.
The film culminates with another narration by Richard Burton, noting the bravery of the defenders who received the Victoria Cross, among them Private Hook—highlighting the heroism that characterized the actual events of Rorke's Drift, where eleven awards were bestowed for courageous acts during the fierce engagements.
