Did the infantry-versus-cavalry setting on plains rather than hills help Charles XII defeat Russian armies?
Short answerTerrain mattered, but so did Russia's weak command-and-control and its difficulty making Peter I's reforms work together as a coherent army.
NotesFighting on plains rather than in hills changes the relationship between infantry and cavalry. Russia's command and control created another weakness that Charles XII could exploit. Peter had reformed many elements of the army without making its commanders and units work together effectively. The resulting gap between individual reforms and coordinated action helped smaller Swedish forces inflict disproportionate damage.