Many of the same people who chased the colonel to his grave are busy shuttling his former arms stockpiles to rebels in Syria. The flow is an important source of weapons for the uprising and a case of bloody turnabout, as the inheritors of one strongman’s arsenal use them in the fight against another.

Evidence gathered in Syria, along with flight-control data and interviews with militia members, smugglers, rebels, analysts and officials in several countries, offers a profile of a complex and active multinational effort, financed largely by Qatar, to transport arms from Libya to Syria’s opposition fighters. Libya’s own former fighters, who sympathize with Syria’s rebels, have been eager collaborators.

“It is just the enthusiasm of the Libyan people helping the Syrians,” said Fawzi Bukatef, the former leader of an alliance of Libyan brigades who was recently named ambassador to Uganda, in an interview in Tripoli.

As the United States and its Western allies move toward providing lethal aid to Syrian rebels, these secretive transfers give insight into an unregistered arms pipeline that is difficult to monitor or control.