sentences:  Perhaps unique in the development of expeditionary warfare were the operations by Yermak during the Russian conquest of Siberia which was a largely land-based operation.This eventually led to the Russian settlement of the Far East and the coast of the Pacific Ocean.The next development in the evolution of the expeditionary warfare was made during the expansion of the western European Empires and the era of colonialism that also led to the inclusion of the expeditionary methods into the direct expression of national strategies to avoid full-scale conflicts in the shape of the gunboat diplomacy approach.