"We're giving that fellow a rare funk, Aubyn," remarked Warborough, as the two officers were standing on the navigation platform.

"An example of the far-reaching effect of Teutonic kultur, I suppose," replied Terence. "By Jove, I reckon her old man is shaking a bit!"

The subject of their conversation was a Dutch tramp steamer of about 1500 tons. Anticipating the execution of von Tirpitz's cowardly threat to sink British merchantmen, she had lost no time in stating her nationality in an unmistakable manner. Her wall sides were painted in horizontal bands in the national colours, in addition to her name and country in letters a yard or more in length. From her ensign staff she flew a Dutch ensign far out of proportion to those usually sported by vessels of that size, while, to make additionally certain that no mistake on the part of a German submarine was possible, she flew another Dutch ensign at her main-masthead.

Directly they spotted the "E Something" running awash and with the White Ensign prominently displayed, the tramp altered her course. Dense columns of black smoke poured from her funnel; every available man of her engine-room staff gave a hand in shovelling the "black diamonds" into the furnaces.

At the very best she could make only eleven knots; had the "E Something" been a German vessel the Dutchman would have stood no chance of escape.

Even as the two officers were watching the panic-stricken tramp, a column of spray shot up fifty feet in the air, about half a cable's length astern of the submarine.

To the accompaniment of a peculiar screeching sound another and yet another column of foam leapt skywards. Both men knew at once from experience what was the meaning of those pillars of spray; they were caused by the series of ricochets of a "common shell."

"Hard a-starboard!" ordered Warborough. The submarine awash presented too big a target broadside on. End-on the area exposed to the distant gun-layer was comparatively small.

"Diving quarters!" shouted the junior officer of the submarine.

In fifteen seconds the hatches were closed and the boat trimmed for diving. At an unusually steep angle she disappeared beneath the surface.