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The systems of trenches made by each country were very complex. The Germans used reinforced concrete to construct deep, shell-proof, ventilated dugouts, as well as strategic strong points. The  British had a main trench system of three parallel lines, interconnected by communications trenches, which were heavily armed in the front. Temporary trenches were also built to use before a big attack was planned.

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Different countries had different attack strategies. The French relied on speed and surprise, the Germans relied on firepower. The Germans got their firepower from howitzers and machine guns. Modern weaponry killed so many people in the trenches because they had more power and were better designed for their specific purposes. For example, machine guns could fire hundreds of bullets in a short time.

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The Western Front is one of the most famous uses of trench warfare (1914 - 1918)

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Trench warfare used elaborate dug out trench systems opposing opposite sides of the battle on a front, protected from assault with mines, barbed wire, and other defenses. "No man's land" was the area between the two fronts, and was completely exposed. Attacks always suffered heavy casualties, even when successful.

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Trench warfare is a type of land warfare using occupied fighting lines consisting largely of military trenches, in which troops are well-protected from the enemy's small arms fire and are substantially sheltered from artillery.