This covert campaign, a combination of paramilitary operations and political reforms, was probably America's most successful counterinsurgency war.

Another was to run covert campaigns to discredit Tung.

For months, she'd been engaged in a covert campaign to accumulate stock of the Stovall Works.

The effectiveness of the covert campaign will not be clear until well into the war, if then.

Clark also launched PsiCorps on a covert campaign to undermine support for the station.

Many commentators argue that supporters of a covert campaign see it as an alternative to war.

Military intelligence waged a covert campaign to undermine the congress.

Iran says western officials' public endorsement of a covert campaign against its nuclear programme is evidence of their involvement in the attacks.

Has he been waging a covert military campaign against maple-syrup smugglers?

Israeli officials have hinted at covert campaigns against Iran without directly admitting involvement.