hmmm, not sure that the guns (or the gun crews) came from the training school though
this bit from the BBC webpage doesn't mention any guns
http://www.bbc.co.uk/history/ww2peopleswar/stories/65/a2289765.shtml
Doctor Wolf Berlin, now nearing eighty, was a young soldier stationed at Bergen, north of Hannover, where together with Officers and Trainee Officers and NCOs from their School near Hannover, they were instructed to march overnight for each night between 24th March and 1st April 1945, a distance of approximately 200 km, carrying all their weapons, food and ammunition to assist in the defence of the town of Ibbenburen, north of the Riesenbecker Ridge of the Teutoburger Wald.
After this exhausting journey, the group comprising about 3000 men circumnavigated to the North of Ibbenburen and finally approached the Western end of the Teutoburger Wald. They then followed the forest paths and approached the top of the Riesenbecker Ridge where they joined up with others and were able to observe the British forces assembled on the South side of the Wald.
would have been pretty impossible to move guns without transport I'm guessing
the guncrews (and the Hitleryouth) must have been some of the 'others' that they joined up wtih I guess
White says 300 men not 3000 too