Meanwhile the destroyer was sending out wireless messages reporting the presence of the raiders. Busy in exchanging wireless signals with their far-flung line of covering torpedo-boats, and with a couple of Zeppelins that flew high overhead, the German vessels made no attempt to "jam" the Calder's aerial warning.
Constantly ready for action at very brief notice, the British battle-squadrons were under weigh within a few minutes of the receipt of the Calder's message, and Beatty's Cat Squadron was heading south-east with all possible speed before the first hostile gun thundered against Great Yarmouth.
"They've opened the one-sided ball," remarked Sefton as a dull boom from the now invisible German ships--a single report that was quickly taken up by other heavy weapons--was borne to the ears of the Calder's crew. "And, by Jove, Whit-Monday too."
"Yes," assented the doctor. "And ten to one the beach is crowded with holiday-makers. Before we left port, didn't we see some idiotic report in the papers stating that the East Coast would be ready for holiday visitors 'as usual'?"
"Let's hope the Huns will get cut off again," said the sub. "Another Blücher or two will make them sit up."
"They're too wary," replied the somewhat pessimistic medico. "They've been warned that the coast is clear. Before the submarines from Harwich can come up they'll be off. And with twelve hours of daylight in front of them they'll be back long before our sixth destroyer flotilla can make a night attack."
For nearly twenty minutes the officers and men listened in silence to the furious bombardment. Several of the latter had homes in the town that now lay exposed to the enemy guns. Realizing their helplessness, they could only hope that the damage done was no greater than that of the previous naval attack on the same place, and that this time the Cat Squadron would intercept the raiders and exact a just and terrible retribution.
At length the firing ceased almost as suddenly as it had begun. In vain the destroyer's crew waited long and anxiously for the renewal of the cannonade in the offing that would announce the gratifying news that Beatty had once more intercepted the returning Huns.
At 20 knots the Calder returned towards the position in which she had left the two trawlers. With feelings of relief it was seen that both craft were still afloat and apparently all well.
Suddenly one of the look-outs raised the shout of: "Submarine on the starboard bow, sir!"