In the meantime one team had become broken down and useless before we got beyond the city. In order to procure another I had to take some of my own men into the mule pen. Three Mexicans were given me to lasso the mules, and five men were required to put them in harness--seasick, wild, little animals. One teamster deserted; one had his hand, and another had his leg broken; and a number of mules in different teams, were crippled. At Vergara, half the load of each wagon was thrown out, before we entered upon steep ridges and deep sand immediately after leaving the beach. All the men were engaged in helping along the half loaded wagons. That night we slept in the sand ridges. On the 14th, we reached Santa Fé, eight miles from Vera Cruz, threw out the half loads, and returned to Vergara. Before we again reached the beach, the men had actually to roll the empty wagons up every hill, the mules not being able to drag them. By 10 P. M., we were again at Santa Fé, having killed three mules, and the men being worked nearly to death. Fortunately for us, several good mules that had escaped from preceding army trains, came out of the chaparral to our feed troughs, were caught, and "pressed" into engineer service. From Santa Fé the road was much better, but at every hill the men had to take to the wheels and help the mules--this too, after throwing out half the load at the foot of some of the steeper hills. In this way, we reached the National Bridge, at 3 P. M. on the 16th. General Worth's division was about starting from that place to make a night march to Plan Del Rio. He informed me that our army would attack the enemy, at the Cerro Gordo Pass, on the afternoon of the 17th; and said he desired that the engineer company should accompany his division. I informed him that my men and animals were utterly exhausted and could not go any further without several hours rest. But I assured him that we would be in Plan Del Rio by noon of the next day. We rested at the National Bridge until 11.30 P. M., on the 16th and reached Plan Del Rio, about 11 A. M., on the 17th. AT CERRO GORDO. Soon after our arrival at Plan Del Rio, I was ordered to detail an officer and ten men of the engineer company to report to General Pillow for temporary service with his division. Lieutenant McClellan was placed in charge of that detail. With the remainder of the company, I was directed to report to Captain R. E. Lee, then acting as Chief Engineer of Twiggs's division; who instructed me to allow the men to rest, whilst I accompanied him to the front, where Twiggs's division was about going into action. Captain Lee informed General Twiggs that the engineer company was at Plan Del Rio, and had been ordered to serve with his division. I was directed by General Twiggs to return at once, and bring the company to the front as soon as possible.