At a venture - literally, as in the margin, i. e. without intent to kill the king.
Between the joints of the harness - literally, as in the margin. The “joints” were probably pieces of armor which attached the breast-plate to the helmet or to the greaves. The arrow entered between the breastplate and one of these “joints.” breastplates made of metal scales were common both in Egypt and Assyria.
Turn thine hand - literally, “turn thy hands.” The driver of a chariot, both in Egypt and Assyria, held the reins with his two hands.