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Perhaps you are talking about "Turkestan line battalions"? But these are the usual garrison or territorial troops for Russia. Here is an article from Wikipedia about such battalions (automatic translation):https://ru-m-wikipedia-org.translate.goog/wiki/%D0%9B%D0%B8%D0%BD%D0%B5%D0%B9%D0%BD%D1%8B%D0%B9_%D0%B1%D0%B0%D1%82%D0%B0%D0%BB%D1%8C%D0%BE%D0%BD?_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hl=ru
Thanks Pier. I found it in book form at Amazon and ordered it. Hard for me to read on the computer.Mark