Wissembourg Gap
Because of the Wissembourg Gap's position on the Franco-German border , it was a strategic terrain corridor for invading forces during the Franco-Prussian War ( Battle of Wissembourg , 1870 ) and during World War II ( Operations Nordwind and Undertone in 1945 ) . 
<triplet> Battle of Wissembourg <subj> Franco-Prussian War <obj> part of