Strategic as their redoubt is, the resistance fighters are cut off and surrounded by the Taliban, have supplies that will soon start dwindling, and have no visible outside support.

For now the resistance has merely two assets: the Panjshir Valley, 70 miles north of Kabul, which has a history of repelling invaders, and the legendary Massoud name.

Spokesmen for Ahmad Massoud insist he has already attracted thousands of soldiers to the valley, including remnants of the Afghan Army’s special forces and some of his father’s experienced guerrilla commanders, as well as activists and others who reject the Taliban’s Islamic Emirate.

The spokesmen, some of whom were with him in the Panjshir Valley and some who were outside the country drumming up support, said that Mr. Massoud has stocks of weapons and matériel, including American helicopters, but needs more.