 In the 16th century the Grand Duchy of Moscow continued activities aimed at unifying the old Rus' lands still under Lithuanian rule.The Grand Duchy of Lithuania had insufficient resources to counter Moscow's advances, already having to control the Rus' population within its borders and not being able to count on loyalty of Rus' feudal lords.As a result of the protracted war at the turn of the 15th and 16th centuries, Moscow acquired large tracts of territory east of the Dnieper River.