To prtect the army from getting shot
by digging trenches and connecting the rivers
they built trenches for procetion and they used it as a base.
The trenches were called saps and the people who dug them were called sappers.
Trench warfare used several different types of trenches. Firing trenches were used by soldiers to protect themselves while firing their weapons at their enemy. Cover trenches were often built next to the firing trenches as a second line of defense in case the enemy captured the firing trench. Support trenches were used as rest areas for off-duty troops, who sometimes lived in dugouts excavated in the sides of the trench. A network of reserve and communications trenches was used to bring supplies and fresh troops to the front.
Because they were fighting a war!!!
Thessaloniki, or Salonika.
They used shovels and picks to dig out the trenches.
Many things made it possible to fire from the trenches. Mortars and field artillery were often fired from trenches. Trenches usually had berms (low dirt walls) built in front of them with firing positions along the top of the berm. Trenches sometimes had benches or ladders for gunners and snipers.
to protect soilders. from enemy shells and mortars but also a place to watch the enemy
with trenching spades if they didn't dig quick enough they risked being shot
The trenches on the western front were built in a more or less continuous line from the North Sea all the way to the border of Switzerland. A distance of about 750 km; considering that both sides used multiple trench lines, plush support trenches, and zigzags across the landscape there would have been several thousand kilometres of trenches being used by either side at any given time.
Trenches were built during wars, particularly in World War I, to provide soldiers with protection from enemy fire and to establish defensive positions. Engineers and soldiers would dig deep, narrow ditches into the ground, often reinforced with wood, sandbags, or metal to prevent collapse. The construction involved careful planning to create a network of trenches that included front-line, support, and communication trenches, allowing for movement and supply while minimizing exposure to danger. These trenches often became complex systems with bunkers, observation posts, and even underground tunnels.