The Peshawar Lancers

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The Peshawar Lancers is an alternate history, steampunk, post-apocalyptic fiction adventure novel by S. M. Stirling, with its point of divergence occurring in 1878 when the Earth is struck by a devastating meteor shower. The novel's plot takes place in the year 2025, at a time when the British Empire has become the powerful Angrezi Raj and is gradually recolonizing the world alongside other nations and empires that were able to survive. The novel was published in 2002, and was a Sidewise Award nominee for best long-form alternate history.
Stirling also wrote a novella, Shikari in Galveston, which is set in the same background as The Peshawar Lancers, but occurs several years earlier. It was published in the alternate history collection Worlds That Weren't.