The varying hopes of Christiern may be gauged with singular accuracy by Fredrik's show of friendship to Gustavus. One cannot read the despatches sent from Denmark without observing a constant change of attitude; the monarch's feelings cooling somewhat as the chance that Christiern would recover Denmark grew more remote. At the moment when Norby returned to Bleking, the movements of Christiern caused the monarch much alarm, and his letters to Gustavus were filled with every assurance of good-will. This assurance, however, Gustavus took at little more than it was worth. So long as Knut and Sunnanväder were protected by Fredrik's officers in Norway, the Danish monarch's assurances of friendship carried little weight. Gustavus seems not to have appealed to Fredrik in this matter till every effort to persuade the Danish officers in Norway had been tried. He wrote even to the Norwegian Cabinet, and begged them to keep the promises made to him in Malmö. While in the midst of these entreaties, a letter came from Fredrik asking for the release of certain prisoners, among them Norby's daughter, whom Gustavus had captured in the war with Norby. This was the very opportunity which Gustavus craved. He wrote back that in the same war in which these prisoners had been taken, some guns belonging to him had been lost, and he offered to exchange the prisoners for the guns. He requested, further, that Fredrik command his officers in Norway to yield the refugees. While this answer was on the road, Fredrik received a note from Norby, to whom Gustavus had written to say that Fredrik had promised that the guns should be returned. Fredrik, therefore, wrote Gustavus that these guns were not in his possession, but if the Danish prisoners were surrendered, he would try to get them. When this letter came, the monarch was indignant. Fredrik, it was clear, was playing with him, and hoped to get the prisoners and give nothing in return. The answer which the monarch made was this: "We have just received your letter with excuses for the detention of our guns and ammunition, along with a request for the surrender of Søren Brun, whom you assert we captured in a time of truce. Of such a truce we wish to inform you we are ignorant. He was lawfully taken, inasmuch as he was one of Norby's men.... As to our ammunition you say that it was captured from you and carried off to Gotland. If so, it was no fault of ours. We have written frequently about it, but have met with nothing but delays. If Norby, who you say has sworn allegiance to you, holds this ammunition in Visby Castle, it is unquestionably in your power to order that it be returned. So soon as this is done, the prisoners shall be released." Before this determined letter arrived in Denmark, Fredrik had modified his plans, for news had come that Christiern's fleet was on the way to Norway, intending to winter there and make an incursion into Denmark in the spring. Fredrik, therefore, despatched a note to Norby telling him to yield the ammunition, and wrote Gustavus that the guns were ready, and if he would send his officers to Denmark for them they should be delivered. A few days later an officer of Fredrik wrote Gustavus that property of Danish subjects had been seized in Sweden, and begged that the persons wronged be recompensed. To this Gustavus answered that Swedish subjects had been treated in the same way in Denmark, and promised to observe the treaty if the Danes would do so in return. He likewise wrote to Fredrik thanking him for his action relating to the guns, declaring that he would send for them as requested, and as soon as they were yielded would set the prisoners free.[122]