Charles was large and strong (his height is well known to have been seven times the length of his foot). On great feast-days he made use of embroidered clothes, and shoes bedecked with precious stones; his cloak was fastened by a golden buckle, and he appeared crowned with a diadem of gold and gems: but on other days his dress varied little from the common dress of the people. His meals ordinarily consisted of four courses, not counting the roast, which his huntsmen used to bring in on the spit; he was more fond of this than of any other dish. While at table, he listened to reading or music.
His military undertaking was the Aquitanian War, begun by his father but not brought to a close. The campaign once opened, he conducted it with the greatest vigor, notwithstanding his broth withheld the assistance that he had promised, and did not desist or shrink from his self-imposed task until, by his patience and firmness, he had completely gained his ends. He compelled Hunold, who had attempted to seize Aquitania after Waifar's death, and renew the war then almost concluded, to abandon Aquitania and flee to Gascony. Even here he gave him no rest, but crossed the River Garonne, built the castle of Fronsac, and sent ambassadors to Lupus, Duke of Gascony, to demand the surrender of the fugitive, threatening to take him by force unless he were promptly given up to him. Thereupon Lupus chose the wiser course, and not only gave Hunold up, but submitted himself, with the province which he ruled, to the King.
The war against the Lombard King Astolf had been taken up and very quickly concluded . Now, although Charles seems to have had similar, or rather just the same grounds for declaring war that his father had, the war itself differed from the preceding one alike in its difficulties and its issue. Pepin, to be sure, after besieging King Astolf a few days in Pavia, had compelled him to give hostages, to restore to the Romans the cities and castles that he had taken, and to make oath that he would not attempt to seize them again: but Charles did not cease, after declaring war, until he had exhausted King Desiderius by a long siege , and forced him to surrender at discretion; driven his son Adalgis, the last hope of the Lombards, not only -from his kingdom, but from all Italy ; restored to the Romans all that they had lost; subdued Hruodgaus, Duke of Friuli , who was plotting revolution; reduced all Italy to his power, and set his son Pepin as king over it. 
At the conclusion of this struggle, The Saxon War, that seems to have been only laid aside for the time , was taken up again. No war ever undertaken by the Frank nation was carried on with such persistence and bitterness, or cost so much labor, because the Saxons, like almost all the tribes of Germany, were a fierce people, given to the worship of devils, and hostile to our religion, and did not consider it dishonorable to transgress and violate all law, human and divine. Then there were peculiar circumstances that tended to cause a breach of peace every day. Except in a few places, where large forests or mountain ridges intervened and made the bounds certain, the line between ourselves and the Saxons passed almost in its whole extent through an open country, so that there was no end to the murders thefts and arsons on both sides. In this way the Franks became so embittered that they at last resolved to make reprisals no longer, but to come to open war with the Saxons . Accordingly war was begun against them, and was waged for thirty-three successive years with great fury; more, however, to the disadvantage of the Saxons than of the Franks. It could doubtless have been brought to an end sooner, had it not been for the faithlessness of the Saxons. It is hard to say how often they were conquered, and, humbly submitting to the King, promised to do what was enjoined upon them, without hesitation the required hostages, gave and received the officers sent them from the King. They were sometimes so much weakened and reduced that they promised to renounce the worship of devils, and to adopt Christianity, but they were no less ready to violate these terms than prompt to accept them, so that it is impossible to tell which came easier to them to do; scarcely a year passed from the beginning of the war without such changes on their part. But the King did not suffer his high purpose and steadfastness - firm alike in good and evil fortune - to be wearied by any fickleness on their part, or to be turned from the task that he had undertaken, on the contrary, he never allowed their faithless behavior to go unpunished, but either took the field against them in person, or sent his counts with an army to wreak vengeance and exact righteous satisfaction. At last, after conquering and subduing all who had offered resistance, he took ten thousand of those that lived on the banks of the Elbe, and settled them, with their wives and children, in many different bodies here and there in Gaul and Germany . The war that had lasted so many years was at length ended by their acceding to the terms offered by the King; which were renunciation of their national religious customs and the worship of devils, acceptance of the sacraments of the Christian faith and religion, and union with the Franks to form one people.
Charles himself fought
but two pitched battles in this war, although it was long
protracted one on Mount Osning , at the place called
Detmold, and again on the bank of the river Hase, both in the
space of little more than a month. The enemy were so routed and
overthrown in these two battles that they never afterwards
ventured to take the offensive or to resist the attacks of the
King, unless they were protected by a strong position. A great
many of the Frank as well as of the Saxon nobility, men occupying
the highest posts of honor, perished in this war, which only came
to an end after the lapse of thirty-two years . So many and
grievous were the wars that were declared against the Franks in
the meantime, and skillfully conducted by the King, that one may
reasonably question whether his fortitude or his good fortune is
to be more admired. The Saxon war began two years  before
the Italian war ; but although it went on without
interruption, business elsewhere was not neglected, nor was t ere
any shrinking from other equally arduous contests. The King, who
excelled all the princes of his time in wisdom and greatness of
soul, did not suffer difficulty to deter him or danger to daunt
him from anything that had to be taken up or carried through, for
he-had trained himself to bear and endure whatever came, without
yielding in adversity, or trusting to the deceitful favors of
fortune in prosperity.
War was declared against the Slavs (Slavic War) who are commonly known among us as Wilzi, but properly, that is to say in their own tongue, are called Welatabians. The Saxons served in this campaign as auxiliaries among the tribes that followed the King's standard at his summons, but their obedience lacked sincerity and devotion. War was declared because the Slavs kept harassing the Abodriti, old allies of the Franks, by continual raids, in spite of all commands to the contrary. A gulf [ie the Baltic Sea] of unknown length, but nowhere more than a hundred miles wide, and in many parts narrower, stretches off towards the east from the Western Ocean. Many tribes have settlements on its shores; the Danes and Swedes, whom we call Northmen, on the northern shore and all the adjacent islands; but the southern shore is inhabited by the Slava and the A´sti [from whom derive the modern name of "Estonia"]; and various other tribes. The Welatabians, against whom the King now made war, were the chief of these; but in a single campaign , which he conducted in person, he so crushed and subdued them that they did not think it advisable thereafter to refuse obedience to his commands.
The war against the Avars, or Huns, followed , and, except the Saxon war, was the greatest that he waged; he took it up with more spirit than any of his other wars, and made far greater preparations for it. He conducted one campaign in person in Pannonia, of which the Huns then had possession. He entrusted all subsequent operations to his son, Pepin, and the governors of the provinces, to counts even, and lieutenants. Although they most vigorously prosecuted the war, it only came to a conclusion after a seven years' struggle. The utter depopulation of Pannonia, and the site of the Khan's palace, now a desert, where not a trace of human habitation is visible bear witness how many battles were fought in those years, and how much blood was shed. The entire body of the Hun nobility perished in this contest, and all its glory with it. All the money and treasure that had been years amassing was seized, and no war in which the Franks have ever engaged within the memory of man brought them such riches and such booty. Up to that time the Huns had passed for, a poor people, but so much gold and silver was found in the Khan's palace, and so much valuable spoil taken in battle, that one may well think that the Franks took justly from the Huns what the Huns had formerly taken unjustly from other nations. Only two of the chief men of the Franks fell in this war - Eric, Duke of Friuli, who was killed in Tarsatch , a town on the coast of Liburnia by the treachery of the inhabitants; and Gerold,Governor of Bavaria, who met his death in Pannonia, slain , with two men that were accompanying him, by an unknown hand while he was marshaling his forces for battle against the Huns, and riding up and down the line encouraging his men. This war was otherwise almost a bloodless one so far as the Franks were concerned, and ended most satisfactorily, although by reason of its magnitude it was long protracted.
The Saxon war next came to an end as successful as the struggle had been long. The Bohemian [805-806] and Linonian  wars that next broke out could not last long; both were quickly carried through under the leadership of the younger Charles. The last of these wars was the one declared against the Northmen called Danes. They began their career as pirates, but afterward took to laying waste the coasts of Gaul and Germany with their large fleet. Their King Godfred was so puffed with vain aspirations that he counted on gaining empire overall Germany, and looked upon Saxony and Frisia as his provinces. He had already subdued his neighbors the Abodriti, and made them tributary, and boasted that he would shortly appear with a great army before Aix-la-Chapelle [Aachen - Charlemagn's capital], where the King held his court. Some faith was put in his words, empty as they sound, and it is supposed that he would have attempted something of the sort if he had not been prevented by a premature death. He was murdered  by one of his own bodyguard, and so ended at once his life and the war that he had begun.
This King, who showed himself so great in extending his empire and subduing foreign nations, and was constantly occupied with plans to that end, undertook also very many works calculated to adorn and benefit his kingdom, and brought several of them to completion. Among these, the most deserving of mention are the basilica of the Holy Mother of God at Aix-la-Chapelle, built in the most admirable manner, and a bridge over the Rhine at Mayence, half a mile long, the breadth of the river at this point. This bridge was destroyed by fire [May, 813] the year before Charles died, but, owing to his death so soon after, could not be repaired, although he had intended to rebuild it in stone. He began two palaces of beautiful workmanship - one near his manor called Ingelheim, not far from Mayence; the other at Nimeguen, on the Waal, the stream that washes the south side of the island of the Batavians. But, above all, sacred edifices were the object of his care throughout his whole kingdom; and whenever he found them falling to ruin from age, he commanded the priests and fathers who had charge of them to repair them , and made sure by commissioners that his instructions were obeyed. He also fitted out a fleet for the war with the Northmen; the vessels required for this purpose were built on the rivers that flow from Gaul and Germany into the Northern Ocean. Moreover, since the Northmen continually overran and laid waste the Gallic and German coasts, he caused watch and ward to be kept in all the harbors, and at the mouths of rivers large enough to admit the entrance of vessels, to prevent the enemy from disembarking; and in the South, in Narbonensis and Septimania, and along the whole coast of Italy as far as Rome, he took the same precautions against the Moors, who had recently begun their piratical practices. Hence, Italy suffered no great harm in his time at the hands of the Moors, nor Gaul and Germany from the Northmen, save that the Moors got possession of the Etruscan town of Civita Vecchia by treachery, and sacked it, and the Northmen harried some of the islands in Frisia off the German coast.