National Intelligencer
August 20, 1847
From: Camp at Buena Vista with Zachary Taylor's Army
"...While we have no expectations whatever of an encounter with a heavy army of the enemy, we have no doubt that parties – guerrilla parties – will keep us somewhat employed and claim at our hands a passing notice. Every train that passes from Camargo to Monterey, or from Monterey to Saltillo, is watched from their mountain passes by these cowardly depredators during its whole route, but they rarely dare an attack, and never without overwhelming odds.
But if a few Texas rangers – any 20 or 30 – are sent with a train, and placed (their proper post) in the advance, that train gets safely through. A lancer's fear of a ranger is most remarkable – remarkable even to ludicrousness, as we learn from the Mexicans about here.
Indeed, all Mexicans, whether friendly or in arms, are dreadfully afraid of them. A few words will explain why and as it is very rarely that these things see the light, even in the immediate neighborhood of the army, or of a town, it may be well to give you some idea of what is a horrid fact. In their capacity of rangers, the Texans, of course, have an endless field of movement. If sent out from a city or a camp they are never expected to return before or until night, or the next day. If attached to a train, they are expected to show themselves occasionally, to signify that they are on alert.

The bowie knife is called upon, and deliberately every male Mexican in that rancho is speedily done for, guilty or not guilty. But these are not enough to make an offset for the life of a Texan. Another rancho receives the fearful visit, and again blood flows.
The number killed on some occasions in this way has been fear fully great. As has been gathered from what fell from the Texans, but no one but themselves knew about it, as a report of any such doings to the nearest commanding officer would only be followed by a tenfold retaliation on the nearest “customers.”
This is all horrid, it is true, but it has had the salutary tendency of causing all well-disposed and honest Mexicans to ferret out and inform on those who practice murder and robbery. Going about at some distance from camp is consequently much more safe."