Ukrainian drone teams demolished a brigade of US Army tanks and armored vehicles during a live war game held this year—but the US soldiers were lucky enough to get “respawn” attempts while learning from the experience.

The semiannual military exercise, called Combined Resolve, gave the US military a firsthand taste of how modern drone warfare has evolved on the battlefields of Ukraine. The Ukrainian drone operators participating in the exercise were easily able to spot and destroy US armored vehicles by mimicking the actions of dropping bombs from above or moving close enough to simulate a kamikaze strike, according to US officials and a participant who spoke with The Wall Street Journal.