From The 3DO Company:
In Heroes III, you control the actions of heroes to complete mission objectives in a variety of conflicts taking place in the mythical land of Erathia. As heroes travel across the land with their armies, they can explore, seek artifacts, and find treasure, as well as lead their armies into battle. Towns can also have armies garrisoned for their defense and act as centers for recruitment, the learning of magic spells, and trading. Towns you conquer become part of your territory. You may develop your towns to provide yourself with offensive, defensive, and logistical advantages.Missions can be self-contained single scenarios, linked together into multi-scenario campaigns, or played as multi-player scenarios against other human players across a network. While a vast array of pre-designed scenarios come with the game, you can also create your own using the provided Map Editor tool.