Britain 's Mark Cavendish claims second win of this year 's Tour . Team Sky 's Bradley Wiggins maintains overall lead . Four riders were unseated in the collision , notably Philippe Gilbert of the BMC team . Dog on the course , multi - car crash . Andy Schleck announces failed ' B ' sample , pleads innocence .
Britain 's Mark Cavendish claims second win of this year 's Tour . Team Sky 's Bradley Wiggins maintains overall lead . Dog on the course , multi - car crash . Andy Schleck announces failed ' B ' sample , pleads innocence .