Nearly every day small armed parties of Mexicans were seen away in advance, and once when we rode to a small pond to water our horses we found a party of Mexican lancers watering theirs also. A few words of salutation passed, when they moved on and disappeared. Once they set the prairie on fire, and we had to drive through the leaping flames with our guns and caissons filled with ammunition.
On the 19th the head of the column was halted and went into camp about three or four miles off the stream called Arroyo Colorado, to wait the arrival or concentration of all the troops, about four thousand in number, and preparation to cross was made by the engineers. On the morning of the 20th, our battery was put in position on the banks of the river where the earth had been cut down for it to cross, and where its fire could command the opposite shore and cover the landing of the infantry. Notice had been given the engineer officer by the Mexicans that the forces on the Mexican shore were under positive orders to fire on any of our troops attempting to cross. Again a like notice was sent to Gen. Taylor, and a proclamation that had been issued by Gen. Mejia a day or two past was handed to him. During this time an awful din was made on the Mexican side by bugle calls away down, and far up the river, and kettledrums and fife in the woods in front. Our guns were loaded and matches lit when the old General gave the command for the infantry to cross. The head of the columns plunged into the water, holding their cartridge boxes and muskets high, and, landing, deployed at once right and left. Other troops crossed above on the right, and when all moved forward not a Mexican was seen.
On the 24th we arrived at a point on the main road running from Point Isabel to Matamoras which was ten miles from Point Isabel and a like distance from Matamoras. Gen. Worth was directed to move on toward the Rio Grande near Matamoras with the infantry, while Gen. Taylor, with our battery and the dragoons, went down to meet Maj. Munroe at Point Isabel, where he had established a depot of supplies for the army. On the 26th Gen. Taylor, with his escort of cavalry and artillery, joined the main body under Worth, and on the 28th the army encamped on the river bank opposite Matamoras.