Defence in depth (also known as deep defence or elastic defence) is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space. Rather than defeating an attacker with a single, strong defensive line, defence in depth relies on the tendency of an attack to lose momentum over time or as it covers a larger area. A defender can thus yield lightly defended territory in an effort to stress an attacker's logistics or spread out a numerically superior attacking force. Once an attacker has lost momentum or is forced to spread out to pacify a large area, defensive counter-attacks can be mounted on the attacker's weak points, with the goal being to cause attrition or drive the attacker back to its original starting position.
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Casualties in the context of Battle of Teruel
The Battle of Teruel was fought in and around the city of Teruel during the Spanish Civil War between December 1937 and February 1938, during the worst Spanish winter in 20 years. The battle was one of the bloodiest actions of the war, with the city changing hands several times by first falling to the Republicans and eventually being retaken by the Nationalists. In the course of the fighting, Teruel was subjected to heavy artillery and aerial bombardment. In the two-month battle, both factions together took 110,000 casualties.
With his superiority in men and material, the Nationalist leader Francisco Franco regained Teruel. This battle became the military turning point of the war.