By the time of the battle of Vienna he was a major-general, and served under King John of Poland during that campaign.

[1] Despite the slight damage to his reputation caused by the incident, Barfus was given command of a Brandenburg contingent assigned to an Austrian army invading Ottoman Turk territory.

Despite suffering heavy losses, the German forces defeated the Turks, and Barfus was promoted to field marshal.

Barfus held several commands during the later part of the decade, including leading a detachment sent to secure the borders with Poland in the aftermath of the death of that nation's king.

[1] Barfus, considered to be incorruptible,[2] enjoyed the premiership for only a brief time, as the Graf von Wartenburg rose to power later that year.