How does James Thomas Flexner use imagery in Washington, the Indispensable Man?

Imagery:

"The officers on their horses were perfect targets. One after another they went down. Washington's horse was shot from under him. He leapt on another. Bullets tore his coat. Braddock toppled over. Washington's second horse crumpled; his hat was shot off. However, as he later wrote, 'the miraculous care of Providence . . . protected me beyond all human expectation.'"

"That his perfidious Indian guide should, even at point-blank range, have missed Washington in the wilderness seems reasonable, but it is strange that during the Braddock massacre, when every other mounted officer was struck, he remained uninjured. And then there was the time he rode between the two firing columns, striking up the guns with his sword. In subsequent years, during the Revolution, Washington was again and again to take the most foolhardy risks, but the bullets, although they tore his clothes and killed his horses, never touched his body."