When no frontal attack came, the conspirators within Medina lost their nerve. Meanwhile, the besieging force began to fragment, for it was a confederation of tribes, most of whom had come along only as a favor to their Qurayshi allies. With no battle to fight, they got restless. When a windstorm blew up—no small matter in this landscape—they drifted off, and soon the Quraysh gave up and went home too.