Treaty of Tientsin
In 1854, The Second Empire joined the Crimean War, which saw France and Britain opposed to the Russian Empire, which was decisively defeated at Sevastopol in 1854–55 and at Inkerman in 1854. In 1856 France joined the Second Opium War on the British side against China; a missionary's murder was used as a pretext to take interests in southwest Asia in the Treaty of Tientsin.