The American General overseeing wars in Iraq and Afghanistan says tough moments are ahead for Kandahar, the southern city where Afghan and international troops plan their next offensive. Gen. David Petraeus made an unannounced visit to the city yesterday to bolster support for the military operation aimed at routing the Taliban from their southern stronghold. The head of the US Central Command told reporters that the Kandahar offensive would not be a conventional operation. He says troops will secure areas around the city so the Afghan government can gain footing in Kandahar and the international community can ramp up aid to improve the quality of life for residents. <br/>