They found the Captain had not been idle while they rested. With his graders he had thrown up mounds of dirt and roots every fifty feet circling the camp.
"Good!" approved Charley, as he viewed the old sailor's work. "When we get behind those we will be fairly safe from bullets. I wish those trees out there were out of the way. They give the enemy too much protection."
"There are only about a dozen of them big enough to give any protection," Walter observed. "Why not blow them up with dynamite?"
The suggestion was a good one and they immediately set about carrying it out. Assisted by the Captain with his graders, they dug holes under the trees' roots and placing several sticks of dynamite under each, thus exploded them with a fuse and cap. The powerful explosive blew the big trees clear out of the ground and in some cases many feet above ground before they fell.
"That's better," said Charley, with satisfaction when the job was completed.
"We can make still another improvement," Walter suggested. "Why not set fire to the roots? They are pitchy enough to burn good and the fires will show up any one trying to approach the camp."
The idea was so feasible that the lads carried it out at once, and by the time night fell a bright glowing ring of fires surrounded the camp.
"I don't believe they will bother us to-night with all those fires going, but we'll keep watch just the same," Charley said. "We cannot be too careful."
The camp was not molested during the night, but about the middle of the night there came explosions at regular intervals from the direction of Indiantown.
Charley chuckled. "They are shutting the stable door after the horse is stolen," he remarked. "They are blowing up the bridges between here and Indiantown."