 Lithuanian officers and troops, who first arrived in the region in May, began to organize military units in the pre-war Sejny county.According to Russian statistics from 1889, there were 57.8% Lithuanians, 19.1% Poles, and 3.5% Belarusians in the Suwałki Governorate.It is generally agreed that Lithuanians formed the majority of the population in the northern Suwałki Governorate, while Poles were concentrated in the south.