The Prussians now turned west against the 8th Confederate Army (troops of Württemberg, Baden, Hesse and Nassau) which protected Frankfurt.

After the 8th Army had lost the Battle of Frohnhofen, near Aschaffenburg, it gave up the defence of Frankfurt and went south-eastward to unite with the Bavarians at the river Tauber.

Württemberg paid an indemnity of 8,000,000 gulden, and concluded a secret offensive and defensive treaty with her conqueror.

Although not officially part of the North German Confederation, the secret treaty effectively bound Württemberg to Prussia.

A few years later, in 1870, Württemberger troops played a creditable part in the Battle of Wörth and in other operations of the Franco-Prussian War.