They were travelling hell-for-leather.    From Wordnet, Princeton University. 

Adjective : The sheriff led the posse in a hell-for-leather chase.    From Dictionary.com. 

Adverb : motorcycles roaring hell-for-leather down the turnpike.    From Dictionary.com. 

I just passed her driving hell-for-leather back toward town.    From Wordnik.com.  [Sharp Edges] Reference

They dashed hell-for-leather from New Orleans up to Washington.    From Wordnik.com.  [Introduction Alexis de Tocqueville's Democracy in America] Reference

A second later and I was in the saddle, riding hell-for-leather for the north.    From Wordnik.com.  [Prester John] Reference

We two alone are just their meat; they come at us confidently, hell-for-leather.    From Wordnik.com.  [Stuka Pilot]

They rode hell-for-leather down the streets, gaudy outfits glittering in the sun.    From Wordnik.com.  [Land of the Burnt Thigh] Reference

At Mayak the Soviet Union was cranking up plutonium in a hell-for-leather arrangement.    From Wordnik.com.  [How the Cold War Ended] Reference

And he just went hell-for-leather to stimulate her, to try and get all her faculties back.    From Wordnik.com.  [Roald Dahl: The Story Of The 'Storyteller'] Reference

Just before the shell fire our burghers had gone out ahead hell-for-leather on either flank.    From Wordnik.com.  [With Botha in the Field] Reference

"Billy the Kid and Pat Garrett were real-life, hell-for-leather characters of the Old West," he said.    From Wordnik.com.  [Old West Outlaw Billy the Kid Fails to Win a Pardon] Reference

Anse had a bad arm, so it was right that he should not go chasing hell-for-leather over rough country.    From Wordnik.com.  [Rebel Spurs] Reference

There's no letdown from explosive start to hell-for-leather finish in this hard-as-nails detective story.    From Wordnik.com.  [Hardcase]

I prepare to unleash a hell-for-leather fury in the name of all that is good and right, all that is Sisqó.    From Wordnik.com.  [FLY FISHING WITH DARTH VADER] Reference

Then everybody runs hell-for-leather for the gold fields, anyone who can get together a pan and a backpack.    From Wordnik.com.  [BOOK VIEW CAFE BLOG » The Way of the Buggy Whip] Reference

Clayton hadn't had to be told to pull in his light stuff; it was all pelting hell-for-leather for Sol and Tellus.    From Wordnik.com.  [First Lensman]

I love the approach, the just throw yourself into itand WRITE, dammit, on the fly, hell-for-leather, don't analyse, just type.    From Wordnik.com.  [Archive 2006-11-01] Reference

That said, Brown can only lose swing voters once so will now go hell-for-leather to shore up the core vote - what's left of it.    From Wordnik.com.  [Ooo I`m Scared] Reference

I'm certain Rooke doesn't always ride hell-for-leather, but her words perpetuate the stereotype of the wild-eyed, irresponsible biker.    From Wordnik.com.  [Born To Be Wild] Reference

Had heard somebody go for the stairs hell-for-leather.    From Wordnik.com.  [Clouds of Witness]

Another was a hell-for-leather cavalryman in the Civil.    From Wordnik.com.  [TIME.com: Top Stories] Reference

C. elegans and the MRSA go at each other hell-for-leather.    From Wordnik.com.  [BBC News | Technology | World Edition] Reference

Here comes the boys splittin 'down the road hell-for-leather.    From Wordnik.com.  [Wyoming, a Story of the Outdoor West] Reference

Here, Gaddy, take the chit to Bingle and ride hell-for-leather.    From Wordnik.com.  [The Story of the Gadsbys] Reference

'It's hell-for-leather till we find a place for a stand,' said Sandy.    From Wordnik.com.  [Greenmantle] Reference

The hare running hell-for-leather, and me after him over brake and dell.    From Wordnik.com.  [Messer Marco Polo] Reference

Unless it begins printing money - hell-for-leather - it is doomed to follow Japan.    From Wordnik.com.  [The Daily Reckoning] Reference

Fate, Kismet, Predestination -- whatever it was, it came zip! boom! hell-for-leather!.    From Wordnik.com.  [Ptomaine Street] Reference

Pilger states the obvious and out come posse, riding hell-for-leather in the wrong direction.    From Wordnik.com.  [WHAT REALLY HAPPENED] Reference

Should helped keep fans of hell-for-leather shooters occupied until Epic announces Gears Of War 3.    From Wordnik.com.  [PS3 NEWS - PlayStation 3 News - PS3News - PS3 Games - PS3 Hacks - PS3 Homebrew] Reference

In other words, life's like fox-hunting; choose your line, choose it slowly and carefully, then follow it 'hell-for-leather.'.    From Wordnik.com.  [The Best Short Stories of 1921 and the Yearbook of the American Short Story] Reference

He went hell-for-leather over a piece of ground which was being watered with H.E., but by the mercy of heaven nothing hit him.    From Wordnik.com.  [Greenmantle] Reference

I didn't go hell-for-leather into the possibilities of HSDPA mobile data or discuss the differences between Android and Symbian.    From Wordnik.com.  [Mobile Industry Review] Reference

Here there are bumps, jumps, thrills and spills as you race hell-for-leather around a series of undulating circuits and rally stages.    From Wordnik.com. Reference

I rode hell-for-leather into town to head 'em off. ".    From Wordnik.com.  [The Fighting Edge] Reference

"I was in a little run-about with a pal when he came scooting by hell-for-leather.    From Wordnik.com.  [The Grell Mystery] Reference

"There was twenty or thirty ships flyin 'in formation, goin' hell-for-leather for the Wabbly.    From Wordnik.com.  [Morale A Story of the War of 1941-43] Reference