From the dissolution of Parliament in April till the end of the year Defoe preached from this text with infinite variety and vigour. It is the chief subject of the second volume of the Review. The elections, powerfully influenced by Marlborough's successes as well as by the eloquent championship of Defoe, resulted in the entire defeat of the High Tories, and a further weeding of them out of high places in the Administration. Defoe was able to close this volume of the Review with expressions of delight at the attainment of the peace for which he had laboured, and, the victory, being gained and the battle over, to promise a return to the intermitted subject of Trade. He returned to this subject in the beginning of his third volume. But he had not pursued it long when he was again called away. The second diversion, as he pointed out, was strictly analogous to the first. It was a summons to him to do his utmost to promote the union of the two kingdoms of England and Scotland. "From the same zeal," Defoe said, "with which I first pursued this blessed subject of peace, I found myself embarked in the further extent of it, I mean the Union. If I thought myself obliged in duty to the public interest to use my utmost endeavour to quiet the minds of enraged parties, I found myself under a stronger necessity to embark in the same design between two most enraged nations."

The union of the two kingdoms had become an object of pressing and paramount importance towards the close of William's reign. He had found little difficulty in getting the English Parliament to agree to settle the succession of the House of Hanover, but the proposal that the succession to the throne of Scotland should be settled on the same head was coldly received by the Scottish Parliament. It was not so much that the politicians of Edinburgh were averse to a common settlement, or positively eager for a King and Court of their own, but they were resolved to hold back till they were assured of commercial privileges which would go to compensate them for the drain of wealth that was supposed to have followed the King southwards. This was the policy of the wiser heads, not to accept the Union without as advantageous terms as they could secure. They had lost an opportunity at the Revolution, and were determined not to lose another. But among the mass of the population the feeling was all in favour of a separate kingdom. National animosity had been inflamed to a passionate pitch by the Darien disaster and the Massacre of Glencoe. The people listened readily to the insinuations of hot-headed men that the English wished to have everything their own way. The counter-charge about the Scotch found equally willing hearers among the mass in England. Never had cool-headed statesmen a harder task in preventing two nations from coming to blows. All the time that the Treaty of Union was being negotiated which King William had earnestly urged from his deathbed, throughout the first half of Queen Anne's reign they worked under a continual apprehension lest the negotiations should end in a violent and irreconcilable rupture.

Defoe might well say that he was pursuing the same blessed subject of Peace in trying to reconcile these two most enraged nations, and writing with all his might for the Union. An Act enabling the Queen to appoint Commissioners on the English side to arrange the terms of the Treaty had been passed in the first year of her reign, but difficulties had arisen about the appointment of the Scottish Commissioners, and it was not till the Spring of 1706 that the two Commissions came together. When they did at last meet, they found each other much more reasonable and practical in spirit than had appeared possible during the battle over the preliminaries. But while the statesmen sat concocting the terms of the Treaty almost amicably, from April to July, the excitement raged fiercely out of doors. Amidst the blaze of recriminations and counter-recriminations, Defoe moved energetically as the Apostle of Peace, making his Review play like a fireman's hose upon the flames. He did not try to persuade the Scotch to peace by the same methods which he had used in the case of the High-fliers and Tackers. His Reviews on this subject, full of spirit as ever, are models of the art of conciliation. He wrestled ardently with national prejudices on both sides, vindicating the Scotch Presbyterians from the charge of religious intolerance, labouring to prove that the English were not all to blame for the collapse of the Darien expedition and the Glencoe tragedy, expounding what was fair to both nations in matters concerning trade. Abuse was heaped upon him plentifully by hot partisans; he was charged with want of patriotism from the one side, and with too much of it from the other; but he held on his way manfully, allowing no blow from his aspersers to pass unreturned. Seldom has so bold and skilful a soldier been enlisted in the cause of peace.

Defoe was not content with the Review as a literary instrument of pacification. He carried on the war in both capitals, answering the pamphlets of the Scotch patriots with counter-pamphlets from the Edinburgh press. He published also a poem, "in honour of Scotland," entitled Caledonia, with an artfully flattering preface, in which he declared the poem to be a simple tribute to the greatness of the people and the country without any reference whatever to the Union. Presently he found it expedient to make Edinburgh his head-quarters, though he continued sending the Review three times a week to his London printer. When the Treaty of Union had been elaborated by the Commissioners and had passed the English Parliament, its difficulties were not at an end. It had still to pass the Scotch Parliament, and a strong faction there, riding on the storm of popular excitement, insisted on discussing it clause by clause. Moved partly by curiosity, partly by earnest desire for the public good, according to his own account in the Review and in his History of the Union, Defoe resolved to undertake the "long, tedious, and hazardous journey" to Edinburgh, and use all his influence to push the Treaty through. It was a task of no small danger, for the prejudice against the Union went so high in the Scottish capital that he ran the risk of being torn to pieces by the populace. In one riot of which he gives an account, his lodging was beset, and for a time he was in as much peril "as a grenadier on a counter-scarp." Still he went on writing pamphlets, and lobbying members of Parliament. Owing to his intimate knowledge of all matters relating to trade, he also "had the honour to be frequently sent for into the several Committees of Parliament which were appointed to state some difficult points relating to equalities, taxes, prohibitions, &c." Even when the Union was agreed to by the Parliaments of both kingdoms, and took effect formally in May, 1707, difficulties arose in putting the details in operation, and Defoe prolonged his stay in Scotland through the whole of that year.

In this visit to Scotland Defoe protested to the world at the time that he had gone as a diplomatist on his own account, purely in the interests of peace. But a suspicion arose and was very free expressed, that both in this journey and in previous journeys to the West and the North of England during the elections, he was serving as the agent, if not as the spy, of the Government. These reproaches he denied with indignation, declaring it particularly hard that he should be subjected to such despiteful and injurious treatment even by writers "embarked in the same cause, and pretending to write for the same public good." "I contemn," he said in his History, "as not worth mentioning, the suggestions of some people, of my being employed thither to carry on the interest of a party. I have never loved any parties, but with my utmost zeal have sincerely espoused the great and original interest of this nation, and of all nations—I mean truth and liberty,—and whoever are of that party, I desire to be with them." He took up the same charges more passionately in the Preface to the third volume of the Review, and dealt with them in some brilliant passages of apologetic eloquence.

"I must confess," he said, "I have sometimes thought it very hard, that having voluntarily, without the least direction, assistance, or encouragement, in spite of all that has been suggested, taken upon me the most necessary work of removing national prejudices against the two most capital blessings of the world, Peace and Union, I should have the disaster to have the nations receive the doctrine and damn the teacher."

"Should I descend to particulars, it would hardly appear credible that in a Christian, a Protestant, and a Reformed nation, any man should receive such treatment as I have done, even from those very people whose consciences and judgments have stooped to the venerable truth, owned it has been useful, serviceable, and seasonable…."

"I am charged with partiality, bribery, pensions, and payments—a thing the circumstances, family, and fortunes of a man devoted to his country's peace clears me of. If paid, gentlemen, for writing, if hired, if employed, why still harassed with merciless and malicious men, why pursued to all extremities by law for old accounts, which you clear other men of every day? Why oppressed, distressed, and driven from his family and from all his prospects of delivering them or himself? Is this the fate of men employed and hired? Is this the figure the agents of Courts and Princes make? Certainly had I been hired or employed, those people who own the service would by this time have set their servant free from the little and implacable malice of litigious persecutions, murthering warrants, and men whose mouths are to be stopt by trifles. Let this suffice to clear me of all the little and scandalous charges of being hired and employed."

But then, people ask, if he was not officially employed, what had he to do with these affairs? Why should he meddle with them? To this he answers:—

"Truly, gentlemen, this is just the case. I saw a parcel of people caballing together to ruin property, corrupt the laws, invade the Government, debauch the people, and in short, enslave and embroil the nation, and I cried 'Fire!' or rather I cried 'Water!' for the fire was begun already. I see all the nation running into confusions and directly flying in the face of one another, and cried out 'Peace!' I called upon all sorts of people that had any senses to collect them together and judge for themselves what they were going to do, and excited them to lay hold of the madmen and take from them the wicked weapon, the knife with which they were going to destroy their mother, rip up the bowels of their country, and at last effectually ruin themselves.