Barack Obama warned today that coalition forces in Afghanistan faced months of hard fighting, but said they had started to "reverse the momentum of the insurgency" by taking the fight to the Taliban. Speaking after a meeting at the White House with the Afghan president, Hamid Karzai, Obama said the deployment of thousands more troops was paying off. "There are many difficult days ahead in Afghanistan. We face a determined and ruthless enemy but we go forward with confidence," he said. Obama said the Afghan government and its allies could not hope to win through military means alone but that keeping up the fight against what he called a brutal insurgency was essential as part of a strategy to encourage Taliban supporters to abandon the conflict.