Richelieu managed to make peace and brought about the marriage of his beautiful young kinswoman to the Marquis of Cambalet, who was de Luynes' nephew. He did not, however, receive the Cardinal's Hat, which had become the chief object of his personal ambition.

The minister, de Luynes, became so unpopular, at length, that his enemies found it possible to retaliate. He favoured the Spanish alliance, whereas many wished to help the Protestants of Germany in their struggle to uphold Frederick, the Elector Palatine, against Ferdinand of Bohemia. The Huguenots rose in the south, and Luynes took the field desperately, for he knew that anything but victory would be fatal to his own fortunes. Songs were shouted in the Paris taverns, satirizing his weak government. Richelieu had bought the service of a host of scribblers in the mean streets near the Place Royale, and these were virulent in verse and pamphlet, according to the dictates of their master.

Fever carried off de Luynes, and the valets who played cards on his coffin were hardly more indecent in their callousness than de Luynes' enemies. The Cardinal's Hat arrived with many gracious compliments to the Bishop of Luçon, who then gave up his diocese. Soon he rustled in flame-coloured taffeta at fêtes and receptions, for wealth and all the rewards of office came to him. As a Prince of the Church, he claimed precedence of princes of the blood, and was hardly astonished when the King requested him to form a ministry. In that ministry the power of the Cardinal was supreme, and he had friends in all posts of importance. With a show of reluctance he entered on his life-work. It was a great and patriotic task—no less than the aggrandisement of France in Europe.

France must be united if she were to present a solid front against the Spanish vengeance that would threaten any change of policy. The Queen-Regent had intended to support Rome, Austria and Spain against the Protestant forces of the northern countries. Richelieu determined to change that plan, but he knew that the time was not yet ripe, since he had neither a fleet nor an army to defeat such adversaries.

The Huguenot faction must be ruined in order that France might not be torn by internal struggles. The new French army was sent to surround La Rochelle, the Protestant fort, which expected help from England. The English fleet tried for fourteen days to relieve the garrison, but had to sail away defeated. The sailors of the town elected one of their number to be Mayor, a rough pirate who was unwilling to assume the office. "I don't want to be Mayor," he cried, flinging his knife upon the Council-Table, "but, since you want it, there is my knife for the first man who talks of surrender." The spirit of resistance within the walls of La Rochelle rose after this declaration. The citizens continued to defy the besiegers until a bushel of corn cost 1,000 livres and an ordinary household cat could be sold for forty-five!

It was Richelieu's intention to starve the inhabitants of La Rochelle into surrender. He had his will, being a man of iron, and held Mass in the Protestant stronghold. He treated the people well, allowing them freedom of religion, but he razed both the fort and the walls to the ground and took away all their political privileges. The Huguenots were too grateful for the liberty that was left to them to menace the French Government any longer. Most of them were loyal citizens and helped the Cardinal to maintain peace. In any case they did not exist as a separate political party.

Richelieu reduced the power of the nobles by relentless measures that struck at their feudal independence. No fortresses were to be held by them unless they lived on the frontiers of France, where some defence was necessary against a foreign enemy. When their strong castles were pulled down, the great lords seemed to have lost much of their ancient dignity. They were forbidden to duel, and dared not disobey the law after they had seen the guilty brought relentlessly to the scaffold. The first families of France had to acknowledge a superior in the mighty Cardinal Richelieu. Intendants were sent out to govern provinces and diminish the local influence of the landlords. Most of these were men of inferior rank to the nobility, who found themselves compelled to go to the wars if they wished to earn distinction. The result was good, for it added many recruits to the land and sea forces.

In 1629, the Cardinal donned sword and cuirass and led out the royal army to the support of the Duke of Mantua, a French nobleman who had inherited an Italian duchy and found his rights disputed by both Spain and Savoy. Louis XIII accompanied Richelieu and showed himself a brave soldier. Their road to Italy was by the Pass of Susa, thick with snow in the early spring and dangerous from the presence of Savoy's hostile troups. They forced their way into Italy, and there Richelieu remained to make terms with the enemy, while Louis returned to his kingdom.

Richelieu induced both Spain and Savoy to acknowledge the rights of the Duke of Mantua, and then turned his attention to the resistance which had been organized in Southern France by the Protestants under the Duke of Rohan. The latter had obtained promises of aid from Charles I of England and Philip IV of Spain, but found that his allies deserted him at a critical moment and left him to face the formidable army of the Cardinal. The Huguenots submitted to their fate in the summer of 1629, finding themselves in a worse plight than they had been when they surrendered La Rochelle, for Richelieu treated with them no longer as with a foreign power. He expected them to offer him the servile obedience of conquered rebels. Henceforth he exerted himself to restore the full supremacy of the Catholic faith in France by making as many converts as was possible and by opening Jesuit and Capuchin missions in the Protestant places. "Some were brought to see the truth by fear and some by favour." Yet Richelieu did not play the part of a persecutor in the State, for he was afraid of weakening France by driving away heretics who might help to increase her strength in foreign warfare. He was pleased to find so many of the Huguenots loyal to their King, and rejoiced that there would never be the possibility of some discontented nobleman rising against his rule with a Protestant force in the background. The Huguenots devoted their time to peaceful worship after their own mind, and waxed very prosperous through their steady pursuit of commerce.

Richelieu returned to France in triumph, having won amazing success in his three years' struggle. He had personal enemies on every side, but for the moment these were silenced. "In the eyes of the world, he was the foremost man in France." For nineteen years he was to be the King's chief minister, although he was many times in peril of losing credit, and even life itself, through the jealous envy of his superiors and fellow-subjects.