London: General Sir Mike Jackson, the head of the British Army during the invasion of Iraq, has launched a scathing attack on the United States for the way it handled the post-war administration of the country.

The former chief of the general staff said the approach taken by Donald Rumsfeld, the then US defence secretary, was "intellectually bankrupt", describing his claim that US forces "don't do nation-building" as "nonsensical".

Sir Mike's comments - made in his forthcoming autobiography Soldier, serialised exclusively in The Daily Telegraph - represent the most outspoken criticism of American military policy in Iraq to come from a senior British officer. His attack - the first time he has revealed the depth of his anger towards the US administration - highlights the deep-seated tension between the British command and the Pentagon during the build-up to and the aftermath of the Iraq campaign in 2003.

Sir Mike, who took command of the British Army one month before US-led forces invaded Iraq, said Rumsfeld was "one of those most responsible for the current situation in Iraq".

Crucially, the general writes, he refused to deploy enough troops to maintain law and order after the collapse of Saddam Hussain's regime, and discarded detailed plans for the post-conflict administration of Iraq that had been drawn up by the US State Department.

In the book, Sir Mike says he believes the entire US approach to tackling global terrorism is "inadequate" because it relies too heavily on military power at the expense of nation-building and diplomacy.

Sir Mike says the failure of the US-led coalition to suppress the Iraqi insurgency four years after Saddam's overthrow was down to the Pentagon's refusal to deploy enough troops. A combined force of 400,000 would be needed to control a country the size of Iraq, but even with the extra troops recently deployed for the US military's "surge" the coalition has struggled to reach half that figure.

Sir Mike is particularly critical of President Bush's decision to hand control of the post-invasion running of Iraq to the Pentagon, when all the post-war planning had been done by the State Department.

He and other senior British officers were opposed to the Pentagon's decision to disband the Iraqi army after Saddam's overthrow, a decision he says "was very shortsighted ... We should have kept the Iraqi security services in being and put them under the command of the coalition".

Sir Mike reveals that he and other senior officers had doubts about the weapons of mass destruction dossier presented by the Blair government in late 2002.

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The approach taken by Donald Rumsfeld was "intellectually bankrupt", his claim that US forces "don't do nation-building" was "nonsensical".

The US approach to tackling global terrorism is "inadequate" because it relies too heavily on military power at the expense of nation-building and diplomacy.

Failure to suppress the Iraqi insurgency was down to Pentagon's refusal to deploy enough troops.

Sir Mike and other senior British officers were opposed to the Pentagon's decision to disband the Iraqi army after Saddam's overthrow, a decision he says "was very shortsighted ... We should have kept the Iraqi security services in being and put them under the command of the coalition".

Sir Mike also reveals that he and other senior officers had doubts about the weapons of mass destruction dossier presented by the Blair government in late 2002.