Diplomacy and Recruitment of Mercenaries before the Battle of Žalgiris by Sven Ekdahl

“…The total number of those soldiers who then changed sides is not known, but a letter to the Grand Master tells at least about two big troops of Bohemian mercenaries. …”
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Armies of War Without Uniforms: Mercenaries and Private Military Companies in Russia’s Interventions in Syria and Ukraine by Çağla Mavruk, Ali Gök

“…In the struggle for influence and power between states, states tend to use mercenaries and PMCs due to reasons such as the economic cost of the regular army, the negative reactions to be received from many actors in an official intervention in the target state, the sanctions of international law and the indignation caused by a possible loss of official soldiers, especially in the society. …”
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The Battle of Žalgiris / Grunwald: Unanswered Questions by Alfredas Bumblauskas

“…The quantity of the heavy mounted soldiers in the tactics of wedge is not decisive - to form spearheads of three corps or wedges the heavy mounted soldiers from the Duke's elite could have sufficed Lithuania, especially having in mind Vytautas' attempts to modernize the army of the Grand Duchy of Lithuania before the battle. …”
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