Home›Military Aircraft›Engine ClassBrowse ByEngine ClassFactsEngine ClassSourcesComments (0)Reader Challenges (0)FactsComparisonEra of EmergenceWell-attested1794 1Engine ClassElectric motorEngine Class2 entriesJetEngine Class155 entriesPistonEngine Class211 entriesRamjetEngine Class3 entriesRocketEngine Class6 entriesRotaryEngine Class1 entryTurbopropEngine Class43 entriesTurboshaftEngine Class2 entriesSources1. Wikipedia: Military aviationtier 2WikipediaMilitary aviation, History section, Battle of Fleurus sentenceQuote, Military aviation, History section, Battle of Fleurus sentenceDuring the Battle of Fleurus in 1794, the French observation balloon l'Entreprenant was used to monitor Austrian troop movements.View the SourceComments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.