In a competition for the commission of figures for the new facade of the Freiburg , he was able to win against a rival tender from the city's own . With his pupil, Wilhelm Merten (1879–1952), he created for the city-hall facade a figure of , the first Count of Freiburg. Another of the niches accommodated Dietsche's statue of Conrad I, Duke of Zähringen, which before finding its more permanent position was exhibited at the Paris World Fair in 1900. It was melted down during the Second World War.) The other two spaces displayed figures of Leopold III, Margrave of Austria and of Charles Frederick, the first Grand Duke of Baden. Four statues in Freiburg's Kaiser-Joseph-Straße were also taken down in 1942 and transported to Hamburg in order to be melted down. Two of these four (Emperor Maximilian I and Rudolf I) were also the work of Fridolin Dietsche, again with input, in the case of King Rudolf's statue, from Wilhelm Merten. The other two, produced between 1899 and 1900, were the work of . When war ended in May 1945 all four of these bronze figures were still intact, but they were in Hamburg and war had exhausted the city's finances. In 1950 the Freiburg city council, mindful of the high cost of transporting the figures back south, renounced any rights to have them returned.