The pack sets off at the start of the Tour's most brutal stage from Lezat-sur-Leze to Saint-Lary Soulan

Lance Armstrong rides with the peloton as they conserve energy before hitting the stage's monstrous climbs

Stage 15 contains four category one climbs and finishes with a "hors category" gradient - the most severe on the Tour

A group of riders break off from the front but the pack stays together as they pass through a tunnel in the Pyrenees

George Hincapie and Oscar Pereiro are left to duel it out, but they are distracted by a fan colliding with a motorbike

Armstrong sticks to rival Ivan Basso like glue as the pair follow the leading group of riders up the final ascent

The shock winner is Armstrong's team-mate Hincapie, who claims his first ever Tour de France stage win

The emotional Discovery Channel "domestique" celebrates his surprise win on the podium

Armstrong secures the yellow jersey for yet another day - his lead over Basso is two minutes 46 seconds