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In page Valens:

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Valens opened the campaign with arrangements aimed at building his troop strength and gaining a toehold in Thrace, then moved out to Adrianople, from whence he marched against the confederated barbarian army. Although negotiations were attempted, these broke down when a Roman unit sallied forth and carried both sides into battle. Valens had left a sizeable guard with his baggage and treasures, depleting his force. His right cavalry wing arrived at the Gothic camp sometime before the left wing arrived. It was a very hot day and the Roman cavalry was engaged without strategic support, wasting its efforts and suffering in the heat.[citation needed]