This BBC story looks at Kunar province, which borders Pakistan in eastern Afghanistan. This part is disturbing:
Despite several major American offensives in Kunar over the past year, the militants keep re-grouping - many of them foreign fighters with al-Qaeda backing.
The trouble it has had in this area has led US forces to use psychological operations, or 'psy-ops' tactics, that one US human rights group alleges could have broken the Geneva conventions governing armed conflict.
US troops have been broadcasting messages which Human Rights Watch says implicitly threatens "collective punishment" for people of the valley.