Grenadiers have an increased burst radius and do more damage to buildings.
—In-game description

Incendiary Grenades is a technology in Age of Empires III that can be researched by European civilizations with access to Grenadiers (British, Dutch, Ottomans, and Russians) at the Arsenal once the Fortress Age is reached, if the Advanced Arsenal Home City Card has been sent. Once researched, it increases the siege attack of Grenadiers by 30% and the radius of their ranged attack's splash damage by 1.

The Garde Imperial 2 improvement also automatically grant the French player Incendiary Grenades.

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