 He also wrote a manual on cavalry tactics that was based on Russian cavalry regulations.Like other observers, though, McClellan did not appreciate the importance of the emergence of rifled muskets in the Crimean War, and the fundamental changes in warfare tactics it would require.The Army adopted McClellan's cavalry manual and also his design for a saddle, dubbed the McClellan Saddle, which he claimed to have seen used by Hussars in Prussia and Hungary.