Hamidullah says he is a member of the Taliban fighting against Operation Moshtarak - a joint Afghan-Nato offensive centred around Marjah, in Afghanistan's southern Helmand province.
He told Al Jazeera that the foreign troops' offensive is not succeeding, as they often kill civilians instead of Taliban fighters.
As a result, he says the Afghan people now support the Taliban more than before.
His statements come after a Nato air strike on what was assumed to be a bus carrying Taliban fighters on Sunday, killed 33 Afghan civilians.
Al Jazeera spoke to Hamidullah in an exclusive interview in Lashkar Gar, Helmand's capital city.
Content on this website is for general information purposes only. Your comments are provided by your own free will and you take sole responsibility for any direct or indirect liability. You hereby provide us with an irrevocable, unlimited, and global license for no consideration to use, reuse, delete or publish comments, in accordance with Community Rules & Guidelines and Terms and Conditions.