As Mr. Platt notes, the Second OpiumWar (1858-60), which culminated in British and French forces winning important diplomatic concessions from the dynasty, took place alongside the Taiping Uprising.
People know the horrific history of the Opium Wars (a war that was fought to allow the British to continue drug trafficking), the subsequent colonization of Hong Kong, and the atrocities of the Rape of Nanking.
Just ask Jardine Matheson, the oldest of Hong Kong's British-owned trading houses and still held reponsible for the 1839-42 opiumwar which won Hong Kong for Britain.