Fieldmarshal Wallis, charged with negligence, was court-martialled and condemned to imprisonment in the castle of Spielberg.
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On July 21, 1739, he commanded the Ottoman army in the Battle of Grocka where he defeated the Austrians, commanded by Count of Wallis.
In 1737, his attempt to conquer Banja Luka failed, but in practically all important engagements of the war, Joseph displayed personal bravery, for example in the Battle of Grocka (on 22 July 1739), where he covered the retreat of the Imperial Army.