One side in this conflict was at one point led by Axel Oxenstierna while one phase in this conflict 
One side in this conflict was at one point led by Axel Oxenstierna while one phase in this conflict was ended by the Battle of White Mountain. One battle during this conflict used mobile artillery to obliterate tightly packed enemy formations known as tercios. During this conflict, the Catholic League led by the Count of Tilly lost the Battle of Breitenfeld against Swedish forces led by Gustavus Adolphus. This conflict was sparked after an incident in which two royal officials were thrown out of window, known as the 2nd Defenestration of Prague. For 10 points, name this conflict ended by the Peace of Westphalia that lasted from 1618-1648.
One side in this conflict was at one point led by Axel Oxenstierna while one phase in this conflict was ended by the Battle of White Mountain.
{Thirty Years’ War}