Most plugs weren't identified except perhaps with a single number stamped on the shell. Lack of specific identification complicates finding some of the plugs. The connector pin numbering is unique to each type of plug, that, and the pin patterns have to be used to identify an unmarked plug...
The artillery of the time was heavy and not mobile enough to keep up with the infantry to destroy bunkers, pillboxes, and other obstacles, with direct-fire. Although the problem was well known in the German army it is General von Manstein who is considered the father of the arm of the ...
Rifle marksmanship, street fighting, river crossings, artillery practice, anti-aircraft and night fighting; long marches, close order drill, schools in chemical warfare, radio communication, identification of aircraft and armored vehicles, and waterproofing; CP exercises, amphibious warfare, hardening exerc...