It was incomplete. The Germans made some feint attacks, but it was outflanked by the Panzer advance through the Ardennes & was effectively useless as a defensive line.
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I guess you are refering to the Maginot line, which was a complex fortress along the border with Germany built between the two world wars.
Maginot Line
The Maginot Line was a long line of underground artillery fortifications constructed by the French to repel an invasion by Germany. The Germans simply went around them.
It was called the Maginot Line, a series of French, not British, fortifications along the German border which were supposedly impenetrable. The Germans avoided this by flanking the line and going around it, invading France through the Ardennes and the Low Countries.