'No man's land'
Just as the name describes it, no mans land is somewhere no soldier would ever want to willingly be. It was the land between the two opposing sides. It was a wasteland of destroyed vegetation, with decaying bodies laying everywhere in sight. There were many mud filled mortar holes dispersed within no mans land. When soldiers went 'over the top' and charged at the opposing side, they would have to run through this wasteland and hope they wouldn't be killed before they reached the other side. They had no other way to fight the war. By this, they attempted to intrude the enemy's trenches and try to kill them. However, before they reach the barbed wire, they are hit with the rattling of machine guns. A simple sweeping motion with the machine gun makes the whole ambush die on spot. Retreating was not an option. The soldiers had to keep trying regardless of the guns, until a retreat was called. Only then could they run back. Though, if they run back before the order, they are shot by their own side.