But Lee was more than merely brave and daring. He was thorough. When work was entrusted to his care he performed it personally, never relying on others further than was absolutely necessary, and never resting satisfied until he was certain that he had accomplished his task. On one of his most important reconnoissances he rode into the interior of the country at night to locate the position of the enemy, and after he had proceeded a considerable distance his guide informed him that if he went any further he would be a prisoner, for the whole Mexican army lay directly in his path. He, accordingly, advanced more cautiously, but the guide again begged him to halt, declaring that he could already see the enemies' tents lying on the hillside below. Peering through the darkness in the direction indicated, Lee discovered what appeared to be an encampment of many thousand men, and for the moment he was tempted to accept his companion's conclusion that this was the main force of the Mexicans. Second thoughts, however, convinced him that he ought not to make a report based upon the eyes of the guide, and, despite the man's frightened protests, he decided to stay where he was and see the situation for himself by daylight. But, before the morning fairly dawned, it was apparent that the supposed army of Mexicans was nothing but a huge flock of sheep and, galloping back with the news that the road was clear, he led a troop of cavalry forward and located the enemy posted many miles away in an entirely different position. The Mexicans stubbornly, though unsuccessfully, resisted the American army as it pushed toward their capital, and in the battles which ensued Lee was so active that his gallant conduct was praised in almost every dispatch of his Chief, who subsequently attributed much of his success "to the skill and valor of Robert E. Lee," whom he did not hesitate to describe as "the greatest military genius in America." Continuous praise from such a source would have been more than sufficient to turn the average officer's head, but Lee continued to perform his duties without showing the least sign of vanity or conceit. Quiet, thoughtful, quick to take advantage of any opportunity, but greedy of neither honors nor personal distinction of any kind, he won the admiration of his comrades as well as the confidence of his superiors, and his promotion, first to the rank of major and then to that of lieutenant-colonel, was universally approved.