Bethlen Gabor, Prince of Transylvania, attacks Austria, 40; prepares to aid Frederick, 44; defeats Bucquoi, 49; threatens Austria, 88, 94; is joined by Mansfeld, 97; withdraws from the contest, 101. Bishoprics, question connected with them left unsettled at the Peace of Augsburg, 10; in the north they mainly fall under Protestant administrators, 12; forcible reconversion of the population where this is not the case, 14; Protestant administrators not acknowledged by the Diet, 14; attempt to bring over Cologne and Strasburg to Protestantism, 14; questions relating to them settled for a time at Mühlhausen, 41; reopened after the battle of Stadtlohn, 67; names of those reclaimed in the Edict of Restitution, 121; arrangement for them at the treaty of Prague, 184. Boguslav, Duke of Pomerania, compelled to accept a garrison by Wallenstein, 108; supports Wallenstein in the siege of Stralsund, 110; complains of Wallenstein's soldiers, 127; submits to Gustavus, 130. Bohemia, the Royal Charter granted in, 25; its infringement, 27; acknowledgment of Ferdinand as its king, 28; revolution in, 29; directors appointed, 32; war begins in, 32; political incapacity of the revolutionary government, 32; it makes application to foreign powers, 35; election of Frederick as king, 38; suppression of the Revolution, 45; occupied by John George, 151; the Saxons driven out of, 155; Torstenson's occupation of, 209. Bohemia, King of, his functions as an Elector, 1. _See_ also Rudolph II., Matthias, Frederick V., and Ferdinand II. Bohemian Brethren expelled from Bohemia, 46. Brandenburg, bishopric of, named in the Edict of Restitution, 131. Brandenburg, Elector of, 1. _See_ also John Sigismund, and George William. Braunau, Protestant church at, 27. Breda, siege of, 76. Breisach, taken by Bernhard, 195. Breisgau, taken possession of by the French, 195. Breitenfeld, battle of, 141. Bremen, archbishopric of, connexion of, with Christian IV., 78; named in the Edict of Restitution, 120; given up to Sweden, 214. Bridge of Dessau, battle of, 96. Brünn, besieged by Torstenson, 209. Brunswick, peace negotiations at, 93. Brussels, conferences for peace at, 52, 57, 60. Bucquoi, commands the army invading Bohemia, 32; defeats Mansfeld, 37; joined by Maximilian, 43; advises to delay a battle, 44; is killed, 49. Buckingham, Duke of, his expedition to Rhé, 114; intends to raise the siege of Rochelle, 115; is murdered, 115. Budweis, attacked by the Bohemians, 32. Burgundy, Eastern. _See_ Franche Comté. Butler, receives orders to capture Wallenstein, 180; consults on the murder with Leslie and Gordon, 180. Calvinism in Germany, 18. Camin, bishopric of, named in the Edict of Restitution, 121. Casale, sieges of, 122, 123. Catalonia, insurrection of, 199.