Why did the british troops make an immediate move to prevent the followers of al-mahdi?​

To prevent violence and damaged to British government.

Explanation:

The British troops make an immediate move to prevent the followers of al-mahdi in order to prevent civil war in the country as well as protect the territory where they live. The British know that these followers of al-mahdi provide damaged to the British government and to its people in order to take revenge from the British government which they done to the al-mahdi.

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