unconventional warfare

American  

noun

1. warfare that is conducted within enemy lines through guerrilla tactics or subversion, usually supported at least in part by external forces.

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Example Sentences

Special forces are a branch of the military trained to carry out covert operations, often through unconventional warfare such as sabotage and diversion.

From Barron's

The Quds force that Soleimani led is a branch of Iran's Islamic Revolutionary Guard Corps which specialises in unconventional warfare and military intelligence.

From BBC

The “Gerasimov Doctrine of Hybrid Warfare” blends conventional and unconventional warfare, essentially expanding military battlefield options infinitely — including into cyberspace.

From Washington Times

Foreign internal defense and unconventional warfare are core missions of the U.S.

From Washington Times

They include small-group tactics and operations to detect ambush sites for improvised explosive devices, according to Russia’s Tass news agency, in apparent preparation for urban battles and unconventional warfare against militias and volunteers.

From Washington Post