Armored vehicles used during the <a href="https://en.wikipedia.org/wiki/Silesian_Uprisings" class="extiw" title="en:Silesian Uprisings">Silesian Uprisings</a>
The New York times
1919-09-28
<a rel="nofollow" class="external text" href="https://www.loc.gov/resource/sn78004456/1919-09-28/ed-1/?sp=9&amp;r=0.066,0.488,0.78,0.369,0">The New York times (New-York), September 28, 1919</a>