A rope long enough to cross the river, therefore, was attached to the back axle of the wagon, and men behind would hold the rope to prevent the wagon "beating" the mules into the water.

This latter rope also served the purpose of bringing the end of the forward one back, to be used over again.

The water was deep enough for a short distance to swim the little Mexican mules which the army was then using, but they, and the wagons, were pulled through so fast by the men at the end of the rope ahead, that no time was left them to show their obstinacy.

In this manner the artillery and transportation of the "army of occupation" crossed the Colorado River.
About the middle of the month of March the advance of the army reached the Rio Grande and went into camp near the banks of the river, opposite the city of Matamoras and almost under the guns of a small fort at the lower end of the town.

There was not at that time a single habitation from Corpus Christi until the Rio Grande was reached.
The work of fortifying was commenced at once.