See also: Treaty of Saint-Germain-in-Bush hammer

The treaty of Saint-Germain, signed October 26th and 27th 1635 during the War Thirty Year old (1618 - 1648), urges Louis XIII required to the duke Bernard of Saxony-Weimar ordering the Swedish and Protestant armies of Germany the means of maintaining an army 18.000 men against the Imperial catholics, as well as the rights and possessions of the Habsbourg in Alsace with personal capacity (of which large the baillage of Haguenau whose the ten imperial cities depend on the Décapole).