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Movies like War and Peace, Part IV: Pierre Bezukhov (1967)

As Moscow is set ablaze by the retreating Russians, the Rostovs flee their estate, taking wounded soldiers with them, and unbeknownst to them, also Andrei. Pierre, dressed as a peasant, tries to assassinate Napoleon but is taken prisoner. As the French are forced to retreat, he's marched for months with the Grande Armée, until being freed by a raiding party. Part four of the four-part adaptation of Leo Tolstoy's 1869 novel.