According to this it was October 1940. If the battalion was part of the brigade. http://www.polandinexile.com/icrb.html All the best Andreas
Thanks. I'm supposing that the other two Battalions arrived at the same time and that the Legion of Officers came later. Useful link that. Do you suppose the Engineer units came at the same time?
Try this website regarding the Polish Carpathian Brigade: http://homepages.force9.net/rothwell/polish.htm