Burnishing :) .............
The answer to this question is already partially in the question: Picasso wanted to show show the horrors of the war, as experienced by the civil population, to the world. He wanted to show that war has devastating effects and by this turn people's opinions against the war.
The bombing was also done by the fascists so the painting can be seen as a symbol for the fights against the fascists.
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Answer:
Impressionism was a radical art movement that began in the late 1800s, centered primarily around Parisian painters.
