Which 1930 film portrays World War I trench warfare from the German side?

In which 1931 Fritz Lang film does Peter Lorre play a child murderer? Which golfer won all four major championships of his day in 1930, a "Grand Slam"? In 1930, who was crowned emperor of Ethiopia? Which 1930 painting shows a woman with a cameo brooch, a balding man with glasses holding a pitchfork, and a Gothic Rev… The 1930 film "Anna Christie" was advertised with the line "Garbo" does what? What was the nickname of 1930s gangster George Kelly? Which New York City mayor of 1934–1945, nicknamed "the Little Flower," has one of the city's airports named after him? Many 1930s comedies were sped up with which type of dialogue, in which actors don't let each other finish?