Players can take supplies from Supply Depots, as long as they are still stocked.
Supplies are automatically refilled in towers and keeps by dolyak supply caravans. These caravans start from friendly resource camps (lumbermills, stonemines etc.) and travel to friendly structures. Supply caravans can be intercepted by enemy players and veteran Sentry.
Resource camps automatically regenerate 10 of their own supply every 30 seconds.