Arnulf was numerically superior and was supported by King Philip I of France .
Robert was able to defeat his rival 's army and took the title of Count of Flanders with the acquiescence of Philip I after a further five years of struggle .
Although Arnulf was numerically superior and was supported by King Philip I of France , Robert was able to defeat his rival 's army and took the title of Count of Flanders with the acquiescence of Philip I after a further five years of struggle .