TAGAB VALLEY, Afghanistan — Hundreds of French and Afghan troops on Sunday pushed into a hostile valley in eastern Afghanistan where militants launch quick attacks, then disappear into hillside villages. The mission: secure the area for a planned bypass road around the Afghan capital to move supplies from neighboring Pakistan.

About 700 French troops, joined by 100 Afghan soldiers, moved into the Tagab valley before dawn with more than 100 armored vehicles. U.S. and French attack helicopters roared overhead as insurgent snipers fired from the roofs of houses onto the advancing column of vehicles, according to a reporter for The Associated Press traveling with the French troops.