Sperrle also returned to Germany .
Sperrle also was replaced by Hellmuth Volkmann ; following disagreements with Volkmann , Von Richthofen would be replaced with Hermann Plocher in early 1938 .
Sperrle also returned to Germany and was replaced by Hellmuth Volkmann ; following disagreements with Volkmann , Von Richthofen would be replaced with Hermann Plocher in early 1938 .