Which British cavalry force of about 660 men was decimated in an 1854 charge at Balaclava?

An 1846 treaty set Washington's northern boundary at the 49th parallel, but Britain kept which island? An 1847 play, "The String of Pearls, or The Fiend of Fleet Street," inspired which Broadway hit? An 1852 survey in British India found that "Peak XV" was the tallest mountain in the world; what is it now called? An 1853 fire at his publisher's warehouse burned the remaining stock of whose books, including "Moby-Dick"? An 1854 cholera outbreak in London ended after Dr. John Snow had the handle removed from what? An 1855 book subtitled "The Economical Relations of Slavery" was titled "___ Is King"? An 1855 earthquake raised the harbor bed of which New Zealand city by over a yard, allowing land to be reclaimed? An 1855 entry in which Scottish missionary's African journal mentions the discovery of Victoria Falls?