As an important defensive facility, the trench should not be dug straight into a straight line when designed, which is due to various tactical considerations and practical needs.
First of all, straight trenches are easy to be broken through by the enemy and quickly expand the results of the entire defensive line, while the curved or "Z" layout is conducive to the construction of a crossfire network, effectively stopping the enemy's offensive and carrying out flank strikes.
Secondly, the straight-line trench is susceptible to direct targeting and cluster bombardment by enemy artillery, and once hit, the destructive power of its shock wave and debris will be maximized in the straight direction, greatly increasing the self-**.
At the same time, the winding trench design helps to disperse the enemy's firepower, and has good concealment and confusion, making it difficult for the enemy to accurately judge the defensive layout and force distribution, thereby improving the survival rate of our battlefield.
In addition, the non-straight trench structure can also enhance the stability of the trench wall itself in combination with the topography and landform, and reduce the risk of soil and rock collapse caused by excavation of too long straight lines.
To sum up, the non-linear layout of trenches is a strategic choice based on actual combat experience and scientific principles, which can maximize the defense efficiency, ensure the safety of soldiers' lives and adapt to the changing war environment, even under the conditions of modern warfare, the improved trench fortifications still play an irreplaceable role in specific situations.