"Three!" he shouted: and turning like lightning to meet this fresh foe, who he guessed would prove the most formidable, the boy saw an immense jet of water spurt high into the air.  Twenty feet it rose, and then descended full and fair upon his head.  A mingled shout of defiance and joy told Hal that his aim had been good, and he continued to ply the hose.  At the same moment eight cannon-balls, five at least of which hit him, were thrown at the harassed defender, whose helmet was now full of sand and water.