While he was speaking, Arnold trained the gun according to a scale on a
curved steel rod which passed through a screw socket in the breech of
the piece.
"Now," he said. "Watch!"
He pressed a button on the top of the breech. There was a sharp but not
very loud sound as the compressed air was released; something rushed out
of the muzzle of the gun, and a few seconds later, Colston could see the
missile boring its way through the air, and pursuing a slanting but
perfectly direct path for the centre of the fortress.
A second later it struck. He could see a bright greenish flash as it
smote the steel roof of the central fort. Then the fort seemed to
crumble up and dissolve into fragments, and a few moments later a dull
report floated up into the sky mingled, as he thought, with screams of
human agony.
For a moment he stared in silence through the glasses, then he turned to
Arnold and said in a voice that trembled with violent emotion--
"Good God, that is awful! The whole of the centre citadel is gone as
though it had been swept off the face of the earth. I can hardly see
even the ruins of it. Surely that's murder rather than war!"
"No more murder than the use of torpedoes in naval warfare, as far as I
can see," replied Arnold coolly. "Remember, too," he continued in a
sterner tone, "that fortress belongs to the power that flogged Radna and
has captured Natasha. Come, let's see what execution you can do."
He crossed the deck and set the other gun by its scale, saying as he did
so--
"Put your finger on the button and press when I tell you."
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