Unit for a duel

• Walk without getting anywhere?
• Rate of movement
• Slow people might be asked to pick it up
• What a race leader sets
• Walk or run
• Take measured steps
• Truman's Sec. of the Army
• Track setting

Wikipedia Word definitions in Wikipedia
Pacé refers to two communes in France: Pacé, Ille-et-Vilaine Pacé, Orne