The darkness gathered around the two ships, and none of the steamers in the distance could any longer be seen. The officers could just make out the steamer ahead, which still kept on her course. The midship gun was now brought into use, and a round shot was sent on its mission to her; but with little chance of hitting her in the increasing gloom, for the sky was obscured with clouds, and all the signs indicated fog during the night, which would be exceedingly favorable to the chase. A flash was seen in the distance, and then came the roar of a heavy gun.