 The 1st Army also conducted two attacks against the Maginot Line further to the east in northern Alsace.One attack broke through a weak section of the line in the Vosges Mountains, but a second attack was stopped by the French defenders near Wissembourg.On 15 June, infantry divisions of the German 7th Army attacked across the Rhine River in Operation "Small Bear", penetrating the defences deep and capturing the cities of Colmar and Strasbourg.