In reply to robthered:
Mont Blanc via three monts route, down the Bosses ridge and across Domes de Miage, then went up Aiguille De Bionnassay, retraced our steps to the Col de Bionnassay and dropped down to the Miage glacier and all the way to the road. Left the Cosmiques hut at 01.00, got to the road at about 19.00 totally knackered. That was in 1983, I'm not sure that way down is recommended these days. I think the glacier has changed quite a lot over the years.
P.S. Didn't know it had a name, but it's in Gaston Rebuffat's book.
Post edited at 20:50