Why did many World War I offensives stop after only a few miles of advance?

During World War I, many offensives on the Western Front stalled after only a few miles because of the immense difficulty in maintaining logistics over devastated terrain.12

While tactical factors—such as the strength of defensive trench systems, barbed wire, and the rapid fire of machine guns and artillery—made breaking through enemy lines extremely difficult, the primary logistical constraint was the inability to move essential supplies forward quickly enough to sustain an advance.12

Key logistical challenges included:
* Supply Chain Failure: Attacking forces often outran their supply lines. Without the ability to rapidly transport fuel, ammunition, and food across ground destroyed by heavy bombardment, troops lost their cohesion and were forced to stop.12
* Transportation Limitations: Before the widespread use of motor transport, armies relied heavily on horse-drawn wagons and railheads. These methods were too slow to keep pace with a fast-moving offensive, especially when moving through areas where roads and infrastructure had been obliterated.23
* Defensive Advantage: Defenders could concentrate their remaining logistical strength on sustaining firepower for stationary or retreating forces, while attackers faced the much more expensive and complex task of supporting a rapid forward movement.2