question: Provide three key factors that contributed to the success of cavalry units in the military campaigns of the late 17th and early 18th centuries. Do not mention the words "speed" or "armor". Conclude with a postscript explaining how one of these factors has influenced modern military tactics.
answer: Three key factors that contributed to the success of cavalry units in the military campaigns of the late 17th and early 18th centuries include:
  
  1. **Mobility**: Cavalry units could traverse a variety of terrains and quickly reposition themselves on the battlefield, providing a tactical advantage over slower-moving infantry. This capability allowed them to exploit gaps in enemy lines and execute flanking maneuvers effectively.
  
  2. **Shock Effect**: The psychological impact of a cavalry charge was significant. The sight and sound of a mass of mounted soldiers approaching at a gallop could instill fear and panic in enemy ranks, often leading to a breakdown in their formations and morale.
  
  3. **Versatility**: Cavalry units were adaptable, serving multiple roles such as reconnaissance, skirmishing, and pursuing retreating foes. Their ability to gather intelligence, harass enemy supply lines, and provide protection for their own forces made them invaluable components of any army.
  
  P.S. The concept of mobility, as demonstrated by historical cavalry units, has greatly influenced modern military tactics. Today, mechanized and air-mobile forces leverage their ability to quickly reposition and adapt to dynamic battlefield conditions, much like cavalry units of the past, ensuring sustained operational effectiveness.