Gustavus Adolphus was convinced that the enemy would not be able to drive him out of Germany. He was more afraid of the coldness and jealousy of his allies, who could easily undermine his authority[23]: and he looked upon Charles I as one of them. At Frankfort on the Main Henry Vane presented himself before Gustavus Adolphus as ambassador of the King of England, in order to invite him to restore the Elector Palatine to his country. The King of Sweden made various objections, founded on his relations with France, which was again showing much regard for the Catholic princes; but he principally urged the request that King Charles should break with Spain[24]. People feared that whenever the King of England saw his brother-in-law restored, he would throw himself entirely on the side of the Spaniards. If, as Charles I said, his relations were such that an agreement with Spain did not prevent him from forming a connexion with Sweden, they yet involved the consequence that this [A.D. 1632.] was never very close; for Sweden was allied with France, whose interests ran exactly counter to those of Spain. Gustavus Adolphus saw with pleasure that the Elector Frederick, with the support of the States-General, of the Prince of Orange and the King of England, joined his camp and followed it for a time. Frederick was present when Gustavus Adolphus conquered Kreuznach, formerly one of his towns; and it appears possible that the reviving affection of his subjects contributed to the result. A couple of English regiments were also engaged here[25], and Frederick welcomed them with satisfaction. He attended the King on his victorious march to the Lech and into Bavaria; every word the King uttered strengthened his hopes of returning in a short time to his country as sovereign. But when he now desired to come forward on his own account and to arm, Gustavus Adolphus would not accede to his wish. He gave him to understand that this would interfere with the success of his own enlistments. The King even hesitated to replace in his hands the government of those circles of the Palatinate which had been reconquered; at all events he annexed to his consent the condition that the Lutherans should be allowed free profession of their faith. Everything led men to expect that if he wrested from the Spaniards the two strongholds which they still retained, he would keep them for a time in his own hands. Even in this moment of apparent success Frederick endured hours of sadness and heavy sorrow of heart. He once with tears in his eyes told Hamilton and Vere that he had rather be out of the world than obliged to submit to the conditions imposed by Sweden.