Just cataloging some stuff, Here is some info...
Heinrich Gustav Albert Barthels was born in Lübeck on the 15th of April 1898 and joined the army on the 24th of September 1914, aged 16 and a half. One day after his 17th Birthday (15th April 1915) he was transfered to a combat unit, the 13. Komp. I.R. 162 (which became the 9. Komp I.R. 187)
On the 1st of July 1915 he was wounded by a bullet on Height 664 to the east of Metzeral. On the 17th of September 1915 he was wounded by artillery on the Schratzmännle. A week later he was promoted to Gefreiter.
On the 8th of March 1916 Barthels was sent to "Sturm Abteilung Rottweil" (The official name seems to have been "Oberrotweil"), he stayed until the 7th of May 1916 when he returned to his unit. The I.R. 187 fought in the Munster Valley at the Schratzmännle, Metzeral, Height 664, Barrenkopf etc from June 1915 until August 1916.
In July 1916 he was awarded the Lübeck Hanseatenkreuz, became a very young Unteroffizier in December 1916 and recieved the Iron Cross 2nd Class in September 1917.