cavalry -
The military arm of service that fights while riding horses.
cavalry -
Branch of military transported by fast light vehicles, the mechanized cavalry.
cavalry -
An individual unit of the cavalry arm of service.
Wikipedia
Cavalry (from French cavalerie, cf. cheval 'horse'), were soldiers or warriors who fought mounted on horseback. Cavalry were historically the third oldest and the most mobile of the combat arms.
OmegaWiki Dictionary
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cavalry The military arm of service that fights while riding horses.