Afghan commandos trained by the SAS have reportedly vowed to fight till their "last drop of blood" to snatch their country back from the Taliban.
Forces are regrouping in the Panjshir Valley, an area north of Kabul, and still determined to continue fighting despite the brutality of Taliban militants.
Taliban opponents who want to join the fight are being asked to flock to Panjshir - where Afghanistan's vice president Amrullah Saleh has declared himself the country's rightful leader.
Saleh tweeted to Afghans: "Join the resistance. I will never, ever and under no circumstances bow to Taliban terrorists."
The nation's president Ashraf Ghani fled the country and is claimed to have escaped with bags of cash worth up to £123million but Saleh has pledged to stay put.
Afghan commandos and special forces are reportedly among those who are gathering together to fight the Taliban despite being hunted by them.
They have reportedly pledged to fight the Taliban for Afghanistan until their "last drop of blood".
The troopers have been trained by soldiers from the US and Britain, reportedly including the SAS, and are considered the best.
A source told Sun Online : "We are thousands and many more are coming. We have local people as well.
"It is not ordinary resistance. It is the resistance of thousands of trained forces who are familiar with every inch of the soil and who has excellent experience in fighting the terrorists for the past 20 years.
"I am not going to die before destroying Taliban. We will fight till the last bullet."
Many of the elite troopers have now gone into hiding or are heading for Panjshir and it is feared they will be killed if they are captured by the Taliban's death squads.
In June 22 troopers were assassinated after they ran out of ammunition while fighting the Taliban in Dawlat Abad.
Panjshir has been described as a "natural fortress" due to the valley's mountainous sides and narrow roads and is now blocked by guards and checkpoints.
Forces from the regular army, who have to back the Taliban, have also reportedly been heading to the valley, carrying with them their weapons and equipment.
They have raised the flag of the Northern Alliance movement - a group of freedom fighters who fought back against the Taliban when they ruled the country during the 90s.
The movement is now officially alive for the first time since 2001, led by the 32-year-old son of its ex-leader Ahmad Shah Massoud who shares his name.
Massoud was assassinated by al-Qaeda, two days before the fall of the Twin Towers on September 11, 2001.
Ahmad Massoud, who was trained at Sandhurst, said: "I am in Panjshir with my people.We will stand with our people to the end."
Afghanistan’s defence minister, Bismillah Khan has pledged to side with the resistance.
The Afghan ambassador to Tajikistan rejected Taliban and said Panjshir would serve as a stronghold for resistance led Saleh.
