Intended for early-game scouting, the Envoy is much like the Native Scout, having higher line of sight, but slower movement and lacking stealth ability. Envoys are primarily used for scouting and exploration, since they are not strong military units and have a wide line of sight. They are useful in the start of the game, since they can be used in the first age, to explore the map and scout out enemy towns. They are not very useful later in the game, with the exception of checking up on the enemy and uncovering stealth units. Their cheap cost provides an effective early warning against impending attacks, although they will usually die in the process.
"Envoys are agents of a government dispatched on diplomatic missions. George Washington served as an envoy to the French with the mission of determining their military strength in the Ohio River Valley and letting the French know that the British wanted them to retreat from the area. He was leading a ragtag group of soldiers to support the construction of Fort Necessity in the valley when his command ran across a small French army. Washington's men killed 10 Frenchmen, including another French envoy carrying a message to the British. Killing an envoy was a breach of military etiquette. This brief exchange was the first in what became the French and Indian War."