A staff officer, who had been sent ahead to select camp, reported at this time the ground west of the Cabo Rojo road as suitable for this purpose; but owing to the suspected proximity of the enemy, whose position had not yet been determined, it was decided to push ahead and beyond the iron bridge. This, despite the fact that the men had now marched 13 miles and were very tired. Once in possession of the bridge and the high ground to the north of it, the command would occupy a strong position, which would make it hard to check its advance on Mayaguez. Accordingly, the advance-guard, under Captain Hoyt, moved forward, deploying its advance party as skirmishers and its supports into a line of squads. In this formation it continued until it had approached the bridge within about 400 yards. At this juncture the enemy opened fire, at first individual fire. The firing aimed at the advance-guard accelerated the march of the Eleventh Infantry, which ... reported to the brigade commander, whose staff had already commenced the demolition of the wire fences enclosing the road. About the time that the brigade commander caused the deployment of two companies to re-enforce the advance-guard,--Major Gilbraith in command,--the enemy, from his position in the hills to the right front, fired volleys at the main body through the interval separating the infantry advance-guard from the cavalry, wounding a number of men, also an officer and several horses of the brigade staff. Meanwhile the artillery battalion, under the authority of the brigade commander, had taken up a position to the left of the road. As the powder used by the enemy was absolutely smokeless, and his position being, moreover, for the most part screened by the trees along the Rio Grande, the question of the exact direction to be given Major Gilbraith's detachment, and to the lines of battle about to be formed from the main column, became a most perplexing one. Luckily, this uncertainty did not last long, those of the enemy's bullets that struck the ground near us solving the problem. Some slight confusion was caused by a premature and hurried deployment of the remaining companies, which interfered somewhat with the brigade commander's intention of forming two additional lines, one to support the fighting line and the other to act as a reserve, or as the changing conditions of the combat might render expedient. But under his supervision this defective formation was soon rectified, three companies being placed on the right and four companies on the left of the road, the former, under Lieutenant-Colonel Burke, moving forward in support of Major Gilbraith, and the latter being held back for a time. Major Gilbraith and Colonel Burke's troops, being unable to cross the creek, passed over the bridge that spans it by the left flank, the former's companies having previously occupied a sheltered place in a ditch parallel to and to the right of the main road. About this time the advance-guard,