Laverde took the green jersey as mountains classification leader after the stage.
"One is never sure of taking the yellow jersey but I'm very close to it," Bauer said.
"Our objective now is to take the yellow jersey" of the overall leader, Armstrong said.
"It's exciting to take the yellow jersey," Armstrong said afterward.
Pineau was third in the stage 12 group sprint, taking the red jersey again for two days with this result.
Lloyd also took the green jersey as mountains classification leader with the day's results.
He won stage 12, claiming his 100th professional victory and taking the red jersey for the third time in the race.
He took the jersey two days later on stage 13 by joining another winning breakaway.
Two days later, Arroyo took the jersey, and kept it for five days.
Casagrande attacked again on the following mountain stage and took the jersey.
Laverde took the green jersey as mountains classification leader after the stage.
"One is never sure of taking the yellow jersey but I'm very close to it," Bauer said.
"Our objective now is to take the yellow jersey" of the overall leader, Armstrong said.
"It's exciting to take the yellow jersey," Armstrong said afterward.
Pineau was third in the stage 12 group sprint, taking the red jersey again for two days with this result.
Lloyd also took the green jersey as mountains classification leader with the day's results.
He won stage 12, claiming his 100th professional victory and taking the red jersey for the third time in the race.
He took the jersey two days later on stage 13 by joining another winning breakaway.
Two days later, Arroyo took the jersey, and kept it for five days.
Casagrande attacked again on the following mountain stage and took the jersey.