What is trench warfare, and why was so much of World War I dominated by this method of fighting?

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Explanation:

trench warfare, warfare in which opposing armed forces attack, counterattack, and defend from relatively permanent systems of trenches dug into the ground. The opposing systems of trenches are usually close to one another. Trench warfare is resorted to when the superior firepower of the defense compels the opposing forces to “dig in” so extensively as to sacrifice their mobility in order to gain protection

A trench system may begin simply as a collection of foxholes hastily dug by troops using their entrenching tools. These holes may subsequently be deepened so that a soldier can safely stand up in one of them, and the individual foxholes may be connected by shallow crawl trenches. From this beginning a system of more permanent field fortifications may be constructed. In making a trench, soil from the excavation is used to create raised parapets running both in front of and behind the trench. Within the trench are firing positions along a raised forward step called a fire step, and duckboards are placed on the often muddy bottom of the trench to provide secure footing.

Trench warfare reached its highest development on the Western Front during World War I (1914–18), when armies of millions of men faced each other in a line of trenches extending from the Belgian coast through northeastern France to Switzerland. These trenches arose within the first few months of the war’s outbreak, after the great offensives launched by Germany and France had shattered against the deadly, withering fire of the machine gun and the rapid-firing artillery piece. The sheer quantity of bullets and shells flying through the air in the battle conditions of that war compelled soldiers to burrow into the soil to obtain shelter and survive

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