A great escape from Stalag Luft III in 1944 was through one of these nicknamed "Harry". What was it?

A grand duchy named for which city was created by Napoleon in 1807 to partly restore the Polish state? How many legs does a grand piano normally have? A grandson of Man o' War, which horse beat War Admiral in a famous match race on November 1, 1938? A gravestone in London's Bunhill Fields marks the burial of which poet-painter who lived from 1757 to 1827? A great gold rush beginning in 1848 sent thousands of people rushing to which future state? Which Colorado ski town is named after a tree? A Greek chorus of mice sang and read the title cards of which 1995 film? Which word names both a Greek god and a shallow cooking vessel?