The overtures of Sweden and the offered mediation of Great Britain and other powers were rejected by Denmark, and the war was thereupon continued with great vigour, but with varying success on either side. However, in the early summer of 1612 the Danes took the important fortresses of Elfsborg and Gullberg, and having the entire command of the Cattegat and the Belts, cut off Sweden from the sea. Later, the Danish fleet anchored inside the rocks at Stockholm, of which the seizure was averted only by the bold strategy of Gustavus Adolphus. This abortive attempt on the capital of Sweden practically concluded the war. Peace was ultimately signed at Knäröd, in Halland, January 18, 1613.[15] During that war the Danish monarch had in his service about eighteen thousand English,[16] French, and German mercenaries; while Gustavus Adolphus, having on his side[17] only one foreign regiment of eight or nine companies, soon found himself "in need of foreign soldiers as well, wherewith to check the attacks of the enemy."[18] Charles IX. had indeed foreseen such a necessity, but no action was apparently taken in that direction until the month of November 1611, when Gustavus Adolphus addressed to Sir James Spens the letter or commission already mentioned, and when also the Queen Dowager of Sweden issued an order[19] for the payment of 10,500 rigsdaller out of a fund at Lübeck to Mönnichhofen, then preparing to proceed to the Netherlands for the enlistment of men, who, according to the letter addressed to Sir James Spens, were to have joined the Scottish auxiliary contingent at Elfsborg. On the 2nd December 1611 Mönnichhofen[20] was appointed commander-in-chief of the Swedish ships-of-war with which he was to have sailed from Elfsborg and brought back his levies. Money being apparently scarce, orders were given that he should be supplied with a certain quantity of ox-hides, for sale on his arrival in Holland, to meet the further expenses of his expedition. But the original plan of fetching and transporting the Netherlands levies in Swedish ships-of-war was ultimately abandoned, and Mönnichhofen reached Holland by another route. The letters discovered at Stockholm by Dr. Yngvar Nielsen prove that Mönnichhofen had by the 1st June 1612 embarked a force of about twelve hundred men at Amsterdam on board four ships, which were detained for five weeks by contrary winds. Mönnichhofen had, therefore, the Swedish agent writes, incurred "extraordinary expenses, to the extent of at least four thousand thalers, in providing the men in the small ships with food and drink, and had consequently to pledge and mortgage all he possessed." He had "also encountered much difficulty and incurred great expense in keeping his men together even before the ships lay wind-bound."