Tigris (Persian Wars).

Fought 363, when the Romans under Julian, crossed the Tigris in the face of a large Persian army, strongly entrenched on the opposite bank. At the first assault, though an attempt at a surprise failed, the Romans stormed the Persian lines, and after 12 hours' fighting, drove them from the field. The Romans only admitted a loss of 75 men, while they claimed that the Persians lost 6,000 killed.