The noise of the oars grew louder until it sounded immediately beneath the defenders. Hogan stood up suddenly, leaned over the rail with a lump of coal in each hand, and threw down viciously. There was a whack as one lump hit the boat, and a grunt as the other struck some man. In return came a terrific crash of rifles, and bullets spattered the iron plates of the Vulcan. Fortunately Hogan had flopped down on deck in time.
At that instant, the searchlight of the mother ship swept the Vulcan's deck with startling brilliance. The first volley had perhaps been the signal, and the fight was on.
There came a clanging of grapnels on the rail over the crouching defenders. Madden flung down the one nearest him, but others came flying through the air to take its place. The prostrate men worked busily dislodging the flukes. The fusillade from below prevented their getting on their knees, and they were forced to lie on their backs as they worked at the hooks. It seemed some sort of queer game: the attackers flinging up scaling irons, the defenders flipping them down. Madden had dislodged two or three, when Mulcher cried out for help.
The enemy had succeeded in catching a fluke on the rail, and putting so much weight on it that the cockney could not prize it off. Immediately Hogan and another defender crawled to Mulcher's aid like big lizards. They thrust in sticks and spikes and prized vigorously, while the bullets were drumming on the plates outside.
It stuck and Leonard started to their aid, when a hook in his own territory demanded his attention. Just then a head came up over the rail just above Hogan and Mulcher. The German had turned his automatic on the defenders when Hogan's shillalah caught him on the temple. He reeled backwards, his pistol spitting into the air. He knocked down the whole line of men below him amid crashings, shoutings and splashings in the water below. The moment the weight was off, Mulcher loosed the grapnel and flung it down into the confusion.
The hail of bullets was immediately renewed, and more hooks came flying over. The iron rails rang like a boiler shop, and the steel missiles glanced off whining like enormous mosquitoes. Madden whirled his head for a glance aft.
The same sort of drama was taking place amidship, boarders were climbing over the rail and arms, sticks, and iron spikes snapped out of the inky shadows and smote them. The invaders fired blindly into the darkness that rimmed the deck. As to whether they were killing or maiming Caradoc's crew, Madden could not tell.
One thing, however, he did observe, that aroused an anxious hope in the boy's heart. A heavy column of smoke ascended from the tug's funnel, and a tongue of steam played in its edge.
A frenzy of impatience seized Madden. If the Vulcan could only get under way and escape the fight! Why didn't they start at once! In the vivid light, he saw the steering wheel turning, apparently of its own accord, and he knew that someone was manipulating the hand grips from the bottom side.
From those slight signs of preparation, Madden's attention was suddenly whipped back to his business, by the sight of two figures climbing on over the prow of the Vulcan. These men had no doubt caught a hook in the anchor port and had climbed up without opposition.