Getting drenched with red wine might not be everyone's idea of fun, but it is the idea behind one of Spain's most popular – and unusual – fiestas.

The town of Haro staged the annual Wine Battle in Spain's Rioja wine-growing region on June 29.

Organizers said the aim is to "cover your neighbor in wine as quickly and completely as you can."

After an early morning Mass was held, participants threw wine over each other while music played until the 70,000 liters of free wine run out.

Among the rules for those taking part: They must wear white, with a red sash; they may use wine-filled water pistols, garden sprayers or buckets; and at no point during the battle can they stop laughing and singing.

Thousands of people came away from Haro's vineyards and woodland soaked from head to toe.

The event was held to celebrate St. Peter and the region's plentiful wine output. 

The festival drew mostly young visitors, from as far away as Australia.