The Light Cannon is an Artillery unit in Age of Empires III: The WarChiefs that is unique to the Iroquois and fulfills the roles of falconet and culverin of the European civilizations. It can be obtained either from the Siege Workshop or through the Tribal Council (the Iroquois equivalent of the Home City).
It does excellent damage against infantry and buildings and is also good against ships. It can also do peripheral damage to nearby targets. The light cannon is strong against ships, infantry, and other artillery. Due to their effectiveness against a wide array of units complimented with a powerful range (most standard artillery have only 28), they are devastating against enemy armies if left unchecked. If the Siege Discipline card is sent, the Iroquois can easily mass a large number of these without a major penalty to the population space.
The Light Cannon is a mixture of Falconet and Culverin. It nearly has the range of the culverin, which makes it effective against other artillery units, and the power of the falconet, which makes it effective against infantry and buildings.
Another advantage is that, unlike European artillery, they spend no time switching between Bombard and Limber mode. Both of the modes have equal speed, and if for any cause they have changed mode, they can change them instantly, allowing them to always remain both mobile and ready for combat.
All of these advantages together makes the light cannon a well rounded artillery piece.
"Most Iroquois campaigns ended up with siege warfare. This fact, combined with the Iroquois predilection for modern weapons (trade steel and gunpowder), meant that they learned to deal with military technology early in their history. The cannon was a natural step in this development. The Light Cannon represents an artillery piece, bought or stolen from European allies, but crewed by Iroquois warriors."