The Fahrpanzer was a mobile artillery piece made prior to World War I in Germany, implemented in several German fortifications from 1890 onward and exported to several foreign military powers prior to the outbreak of hostilities.
After the start of WW1, when the German Army, like all other Armies, found itself lacking artillery, again, like most others armies, took to removing guns from inactive Fortresses and using them in the front lines. So many Fahrpanzers came to be used in Trench positions as well.
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