The phrase "a sacred war" is correct and usable in written English.
It can be used in contexts discussing conflicts that are perceived as having a moral or spiritual significance.
Example: "The leaders rallied their followers, declaring that they were engaged in a sacred war to protect their beliefs and way of life."
Alternatives: "a holy war" or "a divine conflict".
"This is what we call a sacred war".
He warned that another skirmish in the disputed waters would lead to a "sacred war for national reunification".
The recent threat of a "sacred war," according to Korean diplomats in Seoul, did not raise any particular alarms.
This, however, would have been an implausible renunciation of a valuable weapon, the leadership of a Sacred War.
On December 23rd a commander in Pyongyang threatened to use nuclear weapons in a "sacred war" if the North was attacked.
About 2,200 people died, including 900 Dutch nationals and 250 people of Indonesian Dutch origin, and the wrecks have been declared a sacred war grave.
SEOUL — Whenever North Korea sends up a diplomatic flare, as it did recently with a threat to start "a merciless sacred war" against South Korea, the message is delivered in a flamboyant vernacular that can sound comically retro or ominous and threatening.
"If aggressors dare to provoke us, even to the slightest degree, we will never tolerate it but will respond resolutely with a merciless sacred war of justice," said Kim on 1 January on the subject of national security.
"The army and people of the Democratic People's Republic of Korea will start a retaliatory sacred war of their own style, based on nuclear deterrent, any time necessary in order to counter the US imperialists and the South Korean puppet forces deliberately pushing the situation to the brink of a war," the central news agency said.
On Saturday, North Korea threatened to use its nuclear deterrent in a retaliatory, "sacred war" in response to the exercise.
Last June the army warned that artillery was aimed at seven South Korean media groups and threatened a "merciless sacred war".
