Circumcision is not a universal practice. There are basically three large groups of people where a significant percentage were circumcised in the 1940s: people from English-speaking countries, Jews, and Muslims. (This remains largely true today; my source at the bottom includes a number of smaller groups who also practice circumcision). Circumcision became popular in the Anglophone world in the 19th century because it was thought to prevent STDs and masturbation--both of which were considered public health issues--and became increasingly common in America (many WWII soldiers in the Pacific were circumcised because it was thought to prevent infection) until the 1960s, when 80% of all American men were circumcised.

In Europe, on the other hand, there was simply never any cultural pressure to circumcise, except for Jews. I recall reading, though I do not remember the source, an account of a group of men forced to show Nazis their penises, and those who were circumcised were assumed to be Jews and taken to camps.

So, in short, no because there was very little to start.

Source: http://apps.who.int/iris/bitstream/10665/43749/1/9789241596169_eng.pdf