It may not be a bad guess either that this is the vanguard of the army of Cos.

I infer from the volume of dust that it is a considerable force." "Therefore it is wise for us to leave the road and hide as best we can." "Correctly spoken.

The truth needs no bush.

It walks without talking." They turned aside at once, and entered a field of Indian corn, where they hoped to pass quietly out of sight, but some of the lancers came on very fast and noticed the dusty figures at the far edge of the field.
Many of the Mexicans were skilled and suspicious borderers, and the haste with which the two were departing seemed suspicious to them.
Ned and Obed heard loud and repeated shouts to halt, but pretending not to hear passed out of the field and entered a stretch of thin forest beyond.
"We must not stop," said Obed.

"Being regular soldiers they will surely discover, if they overtake us, that we are not Mexicans, and two or three lance thrusts would probably be the end of us.