President Alvaro Uribe, who has made a relentless war on the Farc the hallmark of his two administrations, sent a message to the rebel leader Ivan Marquez, whom he described as the "diplomat of terror".

BBC: Aerial attack kills 13 Farc rebels in Colombia

But the world's Friedmanites have waged a relentless guerrilla war against the idea, denouncing it as a farrago of value-destroying nonsense.

ECONOMIST: Attitudes to business

By 1916 and 1917 the relentless slaughter of a war of attrition had so deepened enmity on both sides that friendly meetings in no-man's-land were all but unthinkable, even at Christmas.

ECONOMIST: Bertie Felstead

This pitched battle is clearly a precursor to the 2012 elections, but it is also the latest shot across the bow of union purists who are relentless in waging a war against government and business for the benefit of their members.

CNN: Unions have to make concessions

Another is Russia taking the towns and holding the north fairly comfortably, but with Chechen guerrillas surviving in the forests and mountains of the south, waging a relentless hit-and-run guerrilla war.

ECONOMIST: Russia��s merciless war

"Comanche stands for many more things than being the lone survivor on the Cavalry side -- he stands for the relentless march of the European settlers across the great plains and the war against the Indians, " said Leonard Krishtalka, director of the Biodiversity Institute at Kansas University.

CNN: The art of living forever: Equine taxidermy

The enthusiastic collaboration among the wider community of 17th Century astronomers, across nations and continents, continuing to exchange astronomical observations even when their countries were at war with one another, is in stark contrast to Flamsteed's relentless withholding.

BBC: A Point of View: Crowd-sourcing comets