hell-bent for leather

… his Supply Officer was hell bent for leather to torpedo his tour as the Commanding Officer and wanted explanations, or at least reassurances.

“Gosh!” said Marking. “Where the hell did the Japs get that? [...Was that] a Jap plane? God damn, it was fast.” And I agreed, “It was hell-bent for leather some place.”

It had been quite some piece of road from an eastern region of Arizona to SOD, but Jethro was hell-bent for leather. His desire for a meeting with Zelda Klemp had taken him over. He'd been driving since late the previous night ...