The far-right National Front (FN) has sent shockwaves through France's political establishment, winning control of a council in a leftwing heartland in local elections marked by abstentionism and voters' desire to punish President Francois Hollande's Socialists.
The anti-immigration, anti-Europe FN gained an overall majority in a town in northern France's mining belt and set itself up for several gains in the south, the first time it has achieved success on such a scale.
The Socialists' nationwide share fell back, while support for conservative UMP remained unchanged, highlighting its failure to exploit Hollande's unpopularity or defuse the challenge from the extreme right.
FN leader Marine Le Pen, who three years ago recast the party founded by her firebrand father in softer, media-friendly tones, said history had been made.
"This marks the end of pendulum swing," she said, referring to the back-and-fro dominance of right and left.