Not only did he conquer new territories he also managed to crush rebellions very quickly such as a rebellion in Bavaria. Led by Duke Tassilo, whose wife was the daughter of Desiderius, the resistance started by disobedience of Charlemagne's orders which resulted in Charlemagne gather his army and marching towards Bavaria at which point Tassilo surrendered and apologized. Next in line to be conquered by the franks were the Danes, Swedes, Slavs and Estonians, which were crushed and annexed easily. .
One of the most notable campaigns however was led against the Huns. Mostly delegated by Charlemagne's son Pepin, the Huns were defeated after much blood was spilled. "These Franks, who until then had seemed almost paupers, now discovered so much gold and silver in the palace and captured so much precious booty in their battles, that it could rightly be maintained that they had in all justice taken from the Huns what these last had unjustly stolen from other nations" (Einhard 67). Charlemagne's last recorded war was against the Danes again who attacked the coasts of Gaul and Germany but their king was assassinated by one of his own men prior to causing any large damage.
Charlemagne was a devout Christian and a firm believer in better education and therefore was a great supporter of both the clergy and faculty. "He gave the monastery many gifts of money and land, with houses and rents and other similar donations. He also presented the reliquary filled with relics and made of solid gold studded with gems, which is called the Shrine of Charles" (Notker 104). He built a great Cathedral, called Holy Mother of God in Aachen and donated a great amount of money and relics to monasteries, churches and other religious institutions. He often personally chose which people would be appointed to different position within the church based on how wise and virtuous the candidates were. Not only did he further and improve religion in his own realm, by conquering other territories he spread the influence of Christianity.