sentences:  Later Charles X learned the art of war under Lennart Torstenson, being present at the second Battle of Breitenfeld (1642) and at Jankowitz (1645).From 1646 to 1648 he frequented the Swedish court, supposedly as a prospective husband of his cousin the queen regnant, Christina of Sweden (1626–89, reigned 1632–54), but her insurmountable objection to wedlock put an end to these anticipations, and to compensate her cousin for a broken half-promise she declared him her successor in 1649, despite the opposition of the Privy Council headed by Axel Oxenstierna.In 1648 he gained the appointment of commander of the Swedish forces in Germany.