The Zulus had outmanoeuvred Chelmsford .
Their victory at Isandlwana was a decisive defeat of the British invasion that forced the main British force to retreat out of Zululand until a far larger British army could be shipped to South Africa for a second invasion .
The Zulus had outmanoeuvred Chelmsford , and their victory at Isandlwana was a decisive defeat of the British invasion that forced the main British force to retreat out of Zululand until a far larger British army could be shipped to South Africa for a second invasion .