During world war 1 the second phase in battles that crossed enemy lines and approached trenches was

Correct

Infantry attack

The second phase of the battles that crossed the enemy lines were the infantry attacks, these attacks managed to attack the enemy trench line often with many losses for the armies.

During the First World War, the Allied army managed to break into the German trench system thanks to the improvement of the tanks, this was known as infantry supported by tanks.

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.