"That we shall learn, Mr. Overton, as soon as we can. We shall also watch the river."

Captain Foster and his lieutenant then returned to camp for a brief period of rest. Both were well satisfied with the early forenoon's work.

There was, however, as Foster guessed, other and grimmer work yet ahead of the military.

CHAPTER XII

THE STEP OF THE STEALTHY ONE

By noon the soldiers at camp found themselves well rested. Nearly all of them had had some hours of sleep.

The midday dinner was served, the officers eating at the same time, though sitting apart from their men. As they finished, Captain Foster said:

"Overton, I shall leave you in command of the camp this afternoon. I shall take Terry with me on a tramp through some of this surrounding country. I want to locate other contraband guns or cartridges, if I can.

Except for necessary duties let the men rest. While we are on this duty most of the work will be done at night. Sleep a part of the afternoon yourself; one of the non-commissioned officers can look after the camp, and call you at need."

His sole sleep lately having been for an hour the night before, Lieutenant Hal needed no urging to seek a cot in the wall-tent set apart for the use of the officers.

"When will you sleep, sir?" Noll ventured to ask.

"When I have time," replied Captain Foster, stifling a yawn and smiling.

"This will not be the first time that I have worked for forty hours without sleep."

But the afternoon prowl revealed no more rifles. There was another surprise. At Agua Dulce were fourteen boats belonging to private owners--all the craft at the village water front. Five of the boats were owned by Mexicans. Somewhat disappointed, Captain Foster and Lieutenant Noll returned to camp.

At the evening meal, just before dark, Captain Foster remarked:

"I've posted a corporal and a guard to see that none of the boats leave sh.o.r.e until they've been found to contain no freight that looks like munitions of war. To my surprise none of the Mexicans showed the slightest interest in my doings. It begins to look as though they have no intention of trying to ferry arms over the frontier at present."

"Are there any steam craft at this point, sir?" inquired Lieutenant Hal.

"Nothing of the sort, Mr. Overton."

"Then, if the Mexicans do plan to get any war supplies over the frontier, don't you imagine that they have arranged for a launch or a tug to drop down the river, or come up the stream, from some other point?"

"That's worth thinking of," muttered the captain, looking thoughtful.

"A boat engaged in such secret work would probably also take the risk of running without lights."

"But a steamer would be bound to make noise enough to give us warning when she attempted to come in toward the sh.o.r.e," pursued Captain Foster.

"That, sir, will depend on how far apart our guards are to-night, or on such other night as the Mexicans may make the attempt."

"Now that our troops are here they may make no attempt," hinted Noll.

"They will if they dare," replied Captain Foster. "If there are six hundred rifles in Guarez's barn, and more elsewhere, then there must be a lot of Mexicans on the other side waiting impatiently for the supplies to reach them. Your suggestion, Mr. Overton, about a steamer, is one that must be kept in mind."

After some thought Captain Foster wrote a telegram, entrusting it to a corporal to take over to the village.

Hal was then directed to take sixty men and to dispose of them in suitable spots along the water-front. Fifty men were to be used for this purpose. A corporal and three men would then patrol along the easterly end of the line, Hal and the few remaining men of his command patroling the western end of the line. Either patrol would be quick to respond to any shot from a sentry.

"This is an exceedingly responsible task, Mr. Overton," Captain Foster informed the young officer. "If you fail at some point, then arms enough to equip a brigade of Mexican rebels may cross the river to-night."

"I shall keep every sense on the alert, sir."

Noll was given command of the camp. Captain Foster, now thoroughly f.a.gged, turned in for a few hours' sleep, after leaving orders to be called at eleven o'clock.

"You will find me prowling about your lines from midnight on, Mr.

Overton," was the captain's last word before turning in. "It is now nearly dark, so I suggest that you march your men without any unnecessary delay."

Two minutes later Lieutenant Hal was marching his command from camp. He did not take his column through the village. Instead, he marched it to the eastward, then over to the river bank.

Posting his fifty sentries about three hundred feet apart the Army boy thus covered a stretch of water-front some three miles in length, the village's strip of river front being nearly at the middle of this line.

Corporal Smith's patrol was at the westerly end of the line. Hal himself headed the patrol at that end. The sentries were instructed to conceal themselves, in order to catch, if possible, any band of rebel smugglers in the act of loading war munitions on a craft.

"Nothing will come of it to-night," muttered Hal to himself, after he had placed his men. "The Mexicans here know that there are troops on the spot. If they were going to ship guns to-night they'd be sure to do it at some point ten or twenty miles from here. This is a job for a whole brigade of infantry. A regiment of cavalry could do more than three regiments of infantry on this work."

But Hal knew that the only two troops of cavalry so far ordered to frontier patrol were two troops at least a hundred miles to the westward. As yet Uncle Sam's soldiers were posted only at particular points known to harbor resolute Mexican rebels.

"The fish can get through the net without the least trouble," thought the young officer.

It was still, dark and quiet out here on the river front. There were no lights, and seemingly none astir except the soldiers.

"Corporal, you stay with the patrol. I'm going to do a little exploring on my own account," said Lieutenant Hal, after another hour had pa.s.sed.

"Very good, sir," replied Corporal Dent.

Hal had no very definite objective when he started off eastward by himself. He had left his sword behind in camp, but his revolver rested in its holster on his right hip.

The more Lieutenant Hal thought about it the less he was inclined to feel that there was any likelihood that Mexicans would attempt to-night to cross the river anywhere in the neighborhood of United States troops.

"The leaders among these fellows all know that they're being watched,"

thought Hal, "and they won't take chances when success means so much to them. Now that the troops have come Guarez and his a.s.sociates will take time to think this matter over. None the less I shall have to be as vigilant as though I knew that they meant business to-night. It would be a fearful black eye on my record as an officer, right at the start, if I allowed the Guarez crowd to get anything real over the river to-night."

As he strolled along the water front the young lieutenant pa.s.sed one of his sentries every few hundred feet. Part of the Army boy's purpose in going along by himself was to make sure that each and all of his men were alert. Their vigil would last until daylight.

In course of time the young officer pa.s.sed the public pier, standing empty and deserted at the foot of the street leading from the village down to the water front. There were several row-boats tied up here at one side. During the day-time they had been under other guard, but now they lay unwatched--to the casual eye. However, within short distances of the pier on either side the young lieutenant knew that he had sentries hidden.

Neither sentry communicated with Lieutenant Overton as he pa.s.sed.

"They're wise men not to hail me here," thought the young lieutenant.

"They can see who I am, and, if there are any Mexicans prowling about here in the shadows, the sentries will not betray themselves."

Hal went on past the pier a little distance.