Hamid Karzai’s government is said to control a mere 30 per cent of Afghanistan. The rest is in the control of tribal leaders and the Taleban. As David Miliband says, we will ‘win’ only by diplomacy.
The long-term stability of the Roman empire depended on the Romans’ ability to rule through local elites. That was fine where the culture was largely urbanised i.e. with administrative structures conducive to governance and taxation, as it was in the Mediterranean and the Greek East where Alexander had been.
But tribal north-west Europe was generally different. True, where tribes were centralised and hierarchical, as in southern England, Romans could get to work. But where they were not, the Romans could ensure control only by maintaining a strong military presence — which defeated the whole principle of local control by local elites.

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