defence in depth

British  

noun

1. military the act or practice of positioning successive mutually supporting lines of defence in a given area

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Example Sentences

In addition, he says, military personnel always think in terms of "risk, defence in depth, layers of defence".

From BBC

In practice this has freed up Ukrainian soldiers to go and fight on the front line, knowing their cities have defence in depth.

From BBC

The one-time spy boss, who headed MI6, the foreign intelligence service, between 2009 and 2014, described Europe as “our defence in depth” and argued that friendly countries gained considerably from sharing intelligence on terrorism.

From The Guardian

The best approach, he says, is “defence in depth”: including several safety features, each compensating for another’s vulnerabilities.

From Economist

When company data are stored on the premises, IT departments have various weapons at their disposal for “defence in depth”—firewalls, signature-based anti-virus software, and “white lists” of people granted access to various files and applications on the company’s network.

From Economist