An extract from a new book by Sebastian Smee—about the Impressionists during the Siege of Paris and Paris Commune—brings to life the peculiar episode of artistic intervention

Plus, the Manet/Degas rivalry in Paris and one of the most significant female Impressionists

The exhibition at the Dulwich Picture Gallery will explore the little-known influence of 18th-century English painting, which the artist encountered on her honeymoon