In 1871 a Russian visitor named Strebnitskiy counted over four thousand "nomad tents" (yurts), implying a population of 16 to 20 thousand Ahal Teke Turkmen, many of whom were killed or dispersed in the 1881 Battle of Geok Tepe. The population was 2,500 in 1881, virtually all Russian. By 1886 Askhabad's population was about 10,000, mainly ethnic Russians. Construction of the Trans-Caspian Railway stimulated an influx of migrants seeking employment, particularly from the Caucasus, Volga Valley, and Iran, and Askhabad's subsequent population growth was as follows: