The guerilla weapon of political warfare. [ Horace Greeley ]

Soldier, rest! thy warfare over.
Dream of fighting fields no more;
Sleep the sleep that knows not breakings,
Morn of toil, nor night of waking. [ Scott ]

The life of a wit is a warfare upon earth. [ Pope ]

It is like the Greek fire used in ancient warfare, which burnt unquenched beneath the water; or like the weeds which, when you have extirpated them in one place, are sprouting forth vigorously in another spot, at the distance of many hundred yards; or, to use the metaphor of St. James, it is like the wheel which catches fire as it goes, and burns with fiercer conflagration as its own speed increases. [ F. W. Robertson ]