Hi Paul, German Engineer Units: This arm includes the regular combat engineers, as well as fortress engineers, construction engineers and regional engineers. On the other hand, engineer arm does not include railway engineers. It should be noted that the personnel of engineer platoons in organic divisional units belong to the arm of the unit which they are serving and not to the engineer arm, although they are trained to perform minor engineer functions. Engineer units often form small detachments within their unit for special missions (such as flamethrower detachments and mine detection detachments. A Pionier-Bataillon is organic in every German Division, varying in strength and composition according to the type of Division. The Fallschirm-Pionier-Bataillon is organized similarly to the engineer battalion in a type 1944 Infantry Division. Bridge columns were, until 1943, an organic component of the engineer battalions in all types of Divisions. At the time of the major reorganization of the German divisions the bridge columns were withdrawn to corps from all but the armored divisions. The different types of bridge columns are designated by various capital letters, i.e. ?B?, ?J?, ?K?, and ?T?, each of which represents the type of bride-building equipment used. Of these the bridge column ?B? has sufficient material to build longer bridges then does column ?K?. However bridges build by ?B? are of wood, while those build by column ?K? are of steel. As the reorganization of the German Divisions of 1943/44 have greatly reduced the strength of most types of organic engineers battalions, the General Headquarters engineer units have gained considerably in their importance. Engineer bridging battalions consisting of four bridging companies and an engineer park company, with a total strength of about 900 men, may be allotted from the General Hq. Various types of bridging columns are usually allotted to corps. Various types of engineer battalions, sometimes controlled by regimental staff, may be employed in the support of the division engineers according to tactical requirements. The construction engineers belonged formerly to a separate arm of inferior status, known as Bautruppen . They were reclassified as engineers in the fall of 1943, and included in the designation of their regiments and various types of battalions their new arm as Pioniere. From: War department Technical Manual TM-E 30_451, 15 March 1945 Regards, Hardy