donkihotis7, you have paid a reasonable price for the plaque, I would of paid that...Menden (Sauerland) is part of Westphalia, and as such came under the juristiction of Army Corps VII with its HQ at Munster, this Army Corps comprised of two Divisions, the 13th and the 14th, each Division comprising of four Regiments each. The 14th Division recruited mainly from the Koln/Wesel area, but the 13th Division recruitment area is closest to Menden. This Division had the Infantry Regiments numbers 13,15,55 and 158. Therefore these three men could of been members of one of these Regiments.....or other arm of service Regiments attached to this Division (Artillery/Pioneers/Jager etc etc) this of course is pure supposition, as we have little to go on, but interesting none the less ! Here is some interesting information, Sauerland - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Menden_(Sauerland) and http://en.wikipedia.org/wiki/13th_Di...(German_Empire) on these last two pages, click on the name "did you mean" and it will take you to the appropriate page ! Hope this helps or at the very least fires the imagination !
Prost ! Steve.