In Gavarnie, take the road to Port de Boucharo and park at the terminus car park at the Col des Tentes.
(S/E) Continue on the road, which is now closed to traffic, and reach the border pass of Boucharo in French, Bajuruelo in Spanish.
(1) Take the wide path on the left, which crosses several streams further on: first the Gave des Tourettes, then the Ruisseau des Gabietous (be careful, as it can be a little slippery on the rocks). Then cross the stream flowing from the Glacier du Taillon, continue along the path and climb the small Col des Sarradets.
(2) Continue until you reach the refuge of the same name.
(3) Take the moraine heading south, cross the small snowfield and finish climbing the Brèche de Roland in the rocks.
(4) Descend via the same route to return to the Col des Tentes car park (S/E).

A very beautiful hike, it's so beautiful that it takes your breath away!