Notes:

Otto Dix was a German painter and printmaker from the early 20th century who was best known for the artwork he created based on his experiences of fighting on the Western Front during World War One.

The Trench, also known as The War (Der Krieg) was one of several anti-war works that Otto Dix created during the 1920's and is one of his most recognisable pieces of art.

The painting was immediately controversial when first exhibited in Cologne in 1923. It was acquired by the Dresden City Museum in 1928 but not exhibited there. The work was condemned by the Nazis, confiscated, and included in the exhibition of degenerate art (Entartete Kunst) held in Munich in 1937. It was sold to an art dealer in early 1940, but its fate is not known. It is considered lost, and may have been destroyed in the war.

Analysis of the painting and all it's finer details can be found at the source.