"Must have some pretty fair shooters over there," said Frank, quietly. "However, they can't see us any better than we can see them. Of course, they can see our craft all right, the same as we can see theirs, but they can't spot us."
"No; nor we can't spot them, which makes it worse," said Jack.
"We'll try a couple of shots for luck," said Frank.
He raised his revolver and fired quickly twice. His efforts were rewarded by a scream, apparently of pain.
"Must have hit one of them," he said grimly.
Again a revolver across the water flashed and the two lads heard a bullet whistle by.
Jack fired but without result and then Frank fired again.
There was another scream.
"Either got the other one, or the same one again," said Frank.
They waited some moments in silence, but no further shots came from the foe.