Breisach. I. Alt, a town of Germany, in Baden, on the Rhine, 12 m. W. of Freiburg; pop. in 1867, 3,272. It is well fortified, and was formerly a bulwark of Germany on the upper Rhine. It has a fine old cathedral, and the inhabitants are engaged in shipping and in the cultivation of tobacco. The town was captured by Bernhard of Saxe-Weimar in 1638 after a long siege, ceded to France in 1648, and restored to Germany in 1697. The French again held it from 1703 to 1715. II. Neu (Fr. Neuf-Brisach), a town of Germany, in Alsace, opposite the preceding, about 2 m. W. of the Rhine, on the Rhone and Rhine canal; pop. in 1866, 1,981. After Alt Breisach had been restored to the German empire, Neu Breisach was, by order of Louis XIV., strongly fortified by Vauban. Fort Mortier, 2 m. N. E. of Neu Breisach, capitulated to the German army on Nov. 7, 1870, and three days later the fortress itself surrendered, when 100 officers, 5,000 men, and 100 pieces of ordnance fell into the hands of the victors.