"I'm going to have another look round the corner," said Bertie at last. "Hold on to the fuse."

He handed the end of the fuse to his subordinate, and having wormed his way out of the tunnel, proceeded cautiously on all-fours along the gallery. On his way he passed the electric light. He twisted off the bulb and crawled on in the dark.

Feeling his way by the east wall of the gallery, he came presently to the break in the woodwork. Very slowly, lying flat on his stomach now, he wriggled forward until his head came opposite the opening. A low passage ran away to his left, obviously leading back to the Boche trenches. Three yards from the entrance the passage bent sharply to the right, thus interrupting the line of sight.

"There's a light burning just round that bend," said Bertie the Badger to himself. "I wonder if it would be rash to go on and have a look at it!"

He was still straining at this gnat, when suddenly his elbow encountered a shovel which was leaning against the wall of the gallery. It tumbled down with a clatter almost stunning. Next moment a hand came round the bend of the tunnel and fired a revolver almost into the explorer's face.

Another shot rang out directly after.

The devoted Howie, hastening to the rescue, collided sharply with a solid body crawling towards him in the darkness.

"Curse you, Howie!" said the voice of Bertie the Badger, with refreshing earnestness. "Get back out of this! Where's your fuse?"

The pair scrambled back into their own tunnel, and the end of the fuse was soon recovered. Almost simultaneously three more revolver-shots rang out.

"I thought I had fixed that Boche," murmured Bertie in a disappointed voice. "I heard him grunt when my bullet hit him. Perhaps this is another one—or several. Keep back in the tunnel, Howie, confound you, and don't breathe up my sleeve! They are firing straight along the gallery now. I will return the compliment. Ouch!"