The hottest day of the year also impacted the horses at Bull Run. Equine veterinarian Mike Odian is giving his two horses 15 gallons of water each per day, five gallons more than their usual average. They seem satiated this morning, having just drunk a gallon.

They also were given space under the shade of trees.

The horses at Camp Manassas do not drink out of communal troughs. Only water buckets. There is a horse herpes virus circulating out West. The virus causes severe neurological deterioration and death. Bucket drinking diminishes the chance these horses will be affected.