Is trust in Jehovah folly or wisdom? That was the question raised by Sennacherib's invasion. A glance at the preceding chapters will show how the high military official, 'the rabshakeh,' or chief of the officers, shaped all his insolent and yet skilful mixture of threats and promises so as to demonstrate the vanity of trust in Egypt or in Jehovah, or in any but 'the great king.' Isaiah had been labouring to lift his countrymen to the height of reliance on Jehovah alone, and now the crucial test of the truth of his contention had come. On the one hand were Sennacherib and his host, flushed with victory, and sure of crushing this puny kinglet Hezekiah and his obstinate little city, perched on its rock. On the other was nothing but a prophet's word. Where is the stronger force? And does political prudence dictate reliance on the Unseen or on the visible? The moment is the crisis of Isaiah's work, and this narrative has been placed, with true insight into its importance, at the close of the first half of this book. To grasp the significance of the text the preceding events have to be remembered. Hezekiah's kingdom had been overrun, and tribute exacted from him. The rabshakeh had been sent from the main body of the Assyrian army, which was down at Lachish in the Philistine low country on the road to Egypt, in order to try to secure Jerusalem by promises and threats, since it was too important a post to leave in the rear, if Egypt was to be invaded. That attempt having failed, and the Egyptian forces being in motion, this new effort was made to induce Hezekiah to surrender. A letter was sent, whether accompanied by any considerable armed force or no does not appear. At this point the narrative begins. It may be best studied as an illustration of the trial of faith, its refuge, its pleading, and its deliverance.