.... July 20.--About 10 a. m. the brigade was formed in two lines, with the left connecting with General Hooker's right. Orders were given to throw up breast-works, but within a few moments after General Johnson sent instructions to stop the works and prepare for an advance on the enemy. At 4.30 p. m. the rebels made a furious attack on our position, entering a portion of our partially constructed works, b...