Final answer:
The Arab and Moorish armies militarily conquered Spain in 711, ending Arian Christianity in the region.
Step-by-step explanation:
The Arab and Moorish armies militarily conquered Spain. In 711, the Arab armies invaded Spain and defeated the Visigothic kingdom, marking the end of Arian Christianity in the region. The Arab conquests in Europe were halted in 732 by a Frankish army led by Charles Martel at the Battle of Poitiers. The Arab armies were skilled and tactically organized, which contributed to their success in conquering large amounts of territory in a relatively short span of time.