From the summer of 1870 to the spring of 1871, famously dubbed the "Terrible Year" by Victor Hugo, Paris and its people were besieged, starved, and forced into surrender by Germans--then imperiled again as radical republicans established a breakaway Commune, ultimately crushed by the French Army after bloody street battles and the burning of central Paris. As renowned art critic Sebastian Smee shows, it was against the backdrop of these tumultuous...