[1] After the Second World War, Thiesies helped form the rugby department of BSG Stahl Hennigsdorf, which he coached until 1977.

He was described as a player of iron discipline by Hermann Meister, long term president of the German Rugby Federation, and was somebody who abstained from alcohol and nicotine, rather devoting his time to running and cycling.

[1] He was part of the German team that achieved Germany's last rugby victory over France, a 3-0 on 27 March 1938 in Frankfurt am Main.

[2] During the Second World War, he was stationed in France and was able to make contact with French rugby players, who he trained with.

Over the years, he was honoured by German and international rugby federations for his service to the sport.