He leaped forward and succeeded in putting his foot in the door before the man could close it.
"Lend me a hand here and force the door!" the lad cried.
Captain Glenn and Williams threw their weight against it. The door was flung open. Jack ducked as he ran in and it was well that he did so.
There was a flash and a bullet sped over his head. Before the man could fire again, Jack had closed with him and reversing his revolver quickly, brought the butt down on the man's head with all his force. The pirate toppled to the floor.
Jack jumped across the inert body. Frank was at his heels.
At the far end of the main room four men barred progress. Frank's revolvers spoke sharply twice as he ran forward and two men dropped. Jack felt a twinge of pain in his left side as he advanced and realized that he had been hit. He did not falter, however. His own revolvers spoke and the door to the next room was closed.
The room in which the six now found themselves was the main room in the fort. Doors led off from three directions, one, as Jack knew, to the wireless room.
"Guard the doors!" shouted Jack. "Shoot the first head you see!"
The others asked no questions but took their positions.
"Frank," said Jack, "we want to get into that wireless room. I don't know how many men there may be in there. I'm going to break in the door. You cover me."