"It may be doubted whether so small a number of men ever employed so short a space of time with greater or more lasting effects upon the history of the world.” — Sir George Otto Trevelyan on the Battles of Trenton and Princeton
Detached Cavalry has two possible effects.
Played prior to a battle against an army possessing one or more cavalry brigades. The ONLY effects are the Army’s Commanding General’s battle rating (offense or defense) is immediately reduced by 2 and no Cavalry general’s battle ratings may be used in the battle. The effects end at the conclusion of the battle. Cavalry generals are not available for casualty determination. OR: Place one PC marker in any space within four spaces (includes river connections) of a single cavalry brigade. The four space range many not be traced through Northeast Alabama. The space may not contain an enemy SP or fort, but may contain an Ironclad or Torpedoes.
If using the first effect, it is played as a Battle Card; if the second, as a regular Event Card. It is not labeled as a Battle Card because it is only sometimes one; the text nevertheless makes it clear.