"I was sustained," he informed Dave and Dan. "It was tough, but the commanding officer directed me to send Cantor under escort back to the '_Long Island_,' with a brief report stating why that officer was placed in arrest."

There followed more waiting, during which the sound of individual firing over the city became more frequent. Cantor's guard returned from the "_Long Island_," with word that Captain Gales had ordered that officer in arrest in his own quarters.

At last orders for Trent's detachment arrived.

"We are to push on into the city," Trent informed his ensigns.

"Twenty more '_Long Island_' men will reach us within three minutes.

We are to silence snipers, and kill them if we catch them red-handed in firing on our forces. Above all, we are directed to be on the alert for any Americans or other foreigners who may be in need of help. We are likely to have a busy night."

Then, turning to his men, he added:

"Fall in by twos! Forward, march!"

CHAPTER XX

THE SKIRMISH AT THE DILIGENCIA

Trent saw his reinforcements approaching, and advanced to pick them up and add them to his command.

The column, now a strong one for patrol purposes, turned at right angles at the first corner, and marched on into the city, from the further side of which came the sound of firing.

Every man with the column carried a hundred and fifty rounds of ammunition. A machine gun was trailed along at the rear, in the event that it might be wanted.

Less than half a mile from the start, Lieutenant Trent's command sighted the American advance line ahead. Some of the seamen and marines in this advanced line occupied rooftops and kept up a variable, crackling fire.

As Trent approached the line, a lieutenant-commander approached him.

"Do you come to reinforce us, Lieutenant?" he inquired.

"No, sir," Trent answered. "We are to patrol, and to took out for Americans and other foreigners who may be in danger."

"Then I would caution you, Lieutenant, that this is the outer line. If you get ahead of us, take extreme care that you do nothing to lead us to mistake you for Mexicans."

"I shall be extremely cautious, sir," Trent replied, saluting, then marched his command through the line and on up the street.

"Good luck to you," called several of the sailors in the line.

"Bring us back a few Mexicans!"

"We'd like to, all right," replied Riley, in an undertone.

"Ensign Darrin, take a petty officer and four men and lead a point,"

Lieutenant Trent ordered. "I don't want the 'glory' of running a command into an ambush."

Calling to Riley and four sailormen, Dave led them down the street at the double-quick until he was two hundred yards in advance Then he led his men on at marching speed.

The work at the "point" is always the post of greatest danger with a marching command. This point is small in numbers, and moves well in advance. If the enemy has posted an ambuscade on the line of march it is the point that runs into this danger.

As they marched Dave did not preserve any formation of his men.

His detachment strode forward, alert and watchful, their rifles ready for instant use.

Three blocks away a horse stood tethered before a door. Hearing the sound of approaching feet a man looked hurriedly out of the doorway. Then he rushed to the horse and untied it.

"Halt!" Shouted Ensign Darrin, as he saw the man dart from the doorway. "Halt!" he ordered, a second time, as the man seized the horses's bridle ready to mount.

Quick as a flash the stranger drew a revolver, firing two shots down the street.

"Fire! Get him!" shouted Darrin.

Five rifles spoke, instantly. Just in the act of reaching the saddle the stranger plunged sideways, fell to the roadway, the startled horse galloping off without its rider.

"Don't run to him," commanded Dave Darrin. "We'll reach him soon enough."

Close at hand it was seen that the man was in the uniform of a Mexican officer. His insignia proved him to be a major.

"Dead," said Riley. "Two pills reached him, and either would have killed."

Dave nodded his head in a.s.sent, adding:

"Leave him. Our work is to keep the point moving."

When they had gone a quarter of a mile further, a sound of firing attracted the attention of the American detachment.

"Lieutenant Trent's compliments, sir," panted a breathless messenger, saluting, "and you will turn down the next corner, Ensign, and march toward the firing."

After a few minutes Dave sighted a large building ahead. He did not know the building, then, but learned afterwards that it was the Hotel Diligencia.

Almost as soon as Darrin perceived the building, snipers on its roof espied the Navy men.

Cr-r-rack! The brisk fire that rang out from the roof of the hotel was almost as regular as a volley of shots would have been.

Darrin ordered his men to keep close to the buildings on either side of the street, and to return the fire as rapidly as good shooting permitted.

"Drive 'em from that roof," was Darrin's order.

Lieutenant Trent arrived on the double-quick with the rest of the detachment.

"Give it to 'em, hot and heavy!" ordered Trent, and instantly sixty rifles were in action.

Suddenly a window, a some distance down the street from the Americans opened, and a man thrust a rifle out, taking aim. That rifle never barked, for Dave, with a single shot from his revolver, sent the would-be marksman reeling back.

"Watch that window, Riley, and fire if a head appears there," Dave directed. "There may be others in that room."

Cat-like in his watchfulness, Riley kept the muzzle of his weapon trained on that window.