AMIENS, France — Andre Greipel won a rain-drenched fifth stage of the Tour de France in a sprint finish on Wednesday, while fellow German Tony Martin kept the yellow jersey and the main Tour contenders stayed safe as others tumbled around them.

Greipel attacked some 100 meters from the line and held on to beat Slovakian Peter Sagan. British sprinter Mark Cavendish finished third.

The mostly flat stage took the riders over 117.5 miles from Arras to Amiens in northern France, passing some of the battlefields of World War One.

Riders hoping for a stress-free stage after three days of intense racing were to be disappointed as the rain, which largely stayed away the day before, thundered down and turned the slippery roads of northern France into something of an ice rink.

Greipel clinched his second stage win of the race so far, punching the air in delight before even crossing the line. It was the third win overall in five stages for German riders after Tony Martin’s success in Tuesday’s fourth stage.

The day’s seventh and biggest crash happened at the back of the peloton with 15.5 miles to go.

While not as brutal as Monday’s huge crash in stage 3, it was spectacular and took down about 30 riders. Three went off the road to the right, tumbling into crash barriers. Behind them, others fell in a domino effect. Frenchman Thibaut Pinot, third on last year’s Tour, was among those to fall in his second crash of the day.

Thankfully, because speeds were not as high as on Monday, most riders were more groggy than hurt as they looked to see where exactly their bike was amid a myriad of spinning pedals and jutting-out handlebars.

Martin, a three-time world time trial champion wearing the leader’s yellow jersey for the first time, ended the day with a lead of 12 seconds over 2013 Tour champion Chris Froome and 25 seconds over American rider Tejay Van Garderen.

With time gaps staying the same, Froome leads two-time Tour champion Alberto Contador by 36 seconds; defending champion Vincenzo Nibali by 1:38 and Colombian rider Nairo Quintana, the 2013 runner-up, by 1:56.

After Frenchman Pierre-Luc Perichon surged ahead in an early solo breakaway, the first crash took down several Cofidis riders, including Nacer Bouhanni, who was taken away in ambulance. Team manager Yvon Sanquer said Bouhanni injured his hips, ribs and a wrist but did not break any bones.

With only 50 miles raced, there was a fifth crash ”“ with Bryan Coquard falling for a second time. American Tyler Farrar, Pinot and Portuguese rider Tiago Machado also fell. Machado clutched his bleeding right knee before carrying on.

Perichon was caught with about 62 miles to go.

After that, the main pack rolled along at a comfortable pace until the peloton split in two as the side winds became stronger.

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