war of nerves

n., pl., wars of nerves.
A conflict marked by psychological tactics, such as intimidation and threats, that are intended to confuse, exhaust, and demoralize an enemy.

A conflict characterized by psychological pressure such as threats and rumors, aiming to undermine an enemy's morale. For example, Her lawyer said the university had waged a war of nerves to persuade his client to resign. This expression alludes to tactics used in World War II. [Late 1930s]

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The noun has one meaning:

Meaning #1: the use of psychological tactics to destroy the opponents' morale
  Synonym: psychological warfare

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