Washington - Senior military officials decided to launch the current U.S.-British military campaign to seize Marjah in large part to influence domestic U.S. opinion on the war in Afghanistan, the Washington Post reported Monday.Marjahh

The Post report, by Greg Jaffe and Craig Whitlock, both of whom cover military affairs, said the town of Marjah would not have been chosen as a target for a U.S. military operation had the criterion been military significance instead of impact on domestic public opinion.

The primary goal of the offensive, they write, is to "convince Americans that a new era has arrived in the eight-year long war…." U.S. military officials in Afghanistan "hope a large and loud victory in Marjah will convince the American public that they deserve more time to demonstrate that extra troops and new tactics can yield better results on the battlefield," according to Jaffe and Whitlock.

A second aim is said to be to demonstrate to Afghans that U.S. forces can protect them from the Taliban.

Despite the far-reaching political implications of the story, the Post buried it on page A9, suggesting that it was not viewed by editors as a major revelation.

Jaffe and Whitlock cite no official sources for the report, but the evidence supporting the main conclusion of the article clearly came from information supplied by military or civilian Pentagon sources. That suggests that officials provided the information on condition that it could not be attributed to any official source.

Some advisers to Gen. Stanley A. McChrystal, the commander of the International Security Assistance Force, told him last June that Kandahar City is far more important strategically than Marjah, according to Jaffe and Whitlock.

Marjah is a town of less than 50,000 people, even including the surrounding villages, according to researcher Jeffrey Dressler of the Institute for the Study of War in Washington, D.C.

That makes it about one-tenth the population of Kandahar City. Marjah is only one of a number of logistical centres used by the Taliban in Helmand province, as Dressler observed in a study of Helmand province published by the Institute last September.

Kandahar, on the other hand, is regarded as symbolically important as the place where the Taliban first arose and the location of its leadership organs even during the period of Taliban rule.

Nevertheless, McChrystal decided to commit 15,000 U.S. troops and Afghan troops to get control of Marjah as the first major operation under the new strategy of the Barack Obama administration.

That decision has puzzled many supporters of the war, such as author Steve Coll, who wrote a definitive history of U.S. policy toward Afghanistan and is now executive director of the New America Foundation. Coll wrote in the New Yorker last week that he did not understand "why surging U.S. forces continue to invest their efforts and their numbers so heavily in Helmand."

Coll pointed to the much greater importance of Kandahar in the larger strategic picture.

The real reason for the decision to attack Marjah, according to Jaffe and Whitlock, was not the intrinsic importance of the objective, but the belief that an operation to seize control of it could "deliver a quick military and political win for McChrystal."

Choosing Kandahar as the objective of the first major operation under the new strategy would have meant waiting to resolve political rivalries in the province, according to the Post article.

In public comments in recent days, CENTCOM chief Gen. David Petraeus has put forward themes that may be used to frame the Marjah operation and further offensives to come in Kandahar later this year.

Last Thursday, an unnamed "senior military official" told reporters, "This is the start point of a new strategy," adding, "This is our first salvo."

On Sunday, Petraeus appeared on NBC's "Meet the Press" and said the flow of 30,000 new troops that President Obama recently ordered to the region is starting to produce "output". Marjah is "just the initial operation of what will be a 12-to-18-month campaign," he said, calling it the "initial salvo".

Petraeus suggested that Taliban resistance to the offensive in Marjah was intense, as if to underline the importance of Marjah to Taliban strategy. "When we go on the offensive," said Petraeus, "when we take away sanctuaries and safe havens from the Taliban and other extremist elements…they're going to fight back."

In fact, most of the Taliban fighters who had been in Marjah before the beginning of the operation apparently moved out of the town before the fighting started.

Petraeus seemed to be laying the basis for presenting Marjah as a pivotal battle as well as a successful model for the kind of operations to follow.

The Post article implies that Petraeus and McChrystal are concerned that the Obama administration is pushing for a rapid drawdown of U.S. forces after mid-2011. The military believes, according to Jaffe and Whitlock, that a public perception of U.S. military success "would almost certainly mean a slower drawdown."

As top commander in Iraq in 2007-2008, Petraeus established a new model for reestablishing public support for a war after it had declined precipitously. Through constant briefings to journalists and Congressional delegations, he and his staff convinced political elites and public opinion that his counterinsurgency plan had been responsible for the reduction in insurgent activities that occurred during this command.

Evidence from unofficial sources indicates, however, that the dynamics of Sunni-Shi'a sectarian conflict and Shi'a politics were far more important than U.S. military operations in producing that result.

McChrystal himself seemed to be hinting at the importance of the Marjah offensive's potential impact on the domestic politics of the war in remarks he made in Istanbul just before it began.

"This is all a war of perceptions," McChrystal said. "This is not a physical war in terms of how many people you kill or how much ground you capture, how many bridges you blow up. This is all in the minds of the participants."

McChrystal went on to include U.S. citizens as well as Afghans among those who needed to be convinced. "Part of what we've had to do is convince ourselves and our Afghan partners that we can do this," he said.

The decision to launch a military campaign primarily to shape public opinion is not unprecedented in U.S. military history.

When President Richard M. Nixon and his National Security Adviser Henry A. Kissinger launched a major bombing campaign against the North Vietnamese capital in late December 1972, they were consciously seeking to influence public opinion to view their policy as much tougher in the final phase of peace negotiations with Hanoi.

The combination of the heavy damage to Hanoi and the administration's heavy spin about its military pressure on the North Vietnamese contributed to broad acceptance of the later conclusion that Kissinger had gotten a better agreement in Paris in February 1973.

In fact, Kissinger had compromised on all the demands he had made before the bombing began. But the public perception was more important to the Nixon White House.

Gareth Porter is an investigative historian and journalist specialising in U.S. national security policy. The paperback edition of his latest book, "Perils of Dominance: Imbalance of Power and the Road to War in Vietnam", was published in 2006.

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