War was declared against the Saxons at the “field of May” (Maifeld, champ de Mai, formerly Märzfeld, champs de Mars) at Worms in the year 772. The army set out and first took the Ehresburg, the principal stronghold of the Saxons on the Diemel, on the site of the present Stadtberge. Then the sanctuary in the Egge, where the Irminsul stood—a mighty tree trunk which, according to the faith of the Saxons, supported the universe—was destroyed. The entire country as far as the Weser was ravaged with fire and sword. The Saxons dared not meet the warlike Franks in open battle, and as the latter advanced further into the country most of the tribes swore submission and gave hostages to the king. Christian priests at once went through the land and preached, along with Christianity, submission to the Frankish monarchy, but they preached to deaf ears; hardly had Charles left the Saxon boundary when the people rose in mass, retook the Ehresburg, captured the Siegburg on the Ruhr, and overran the territory of Frankish occupation.
In the year 775 Charles had to begin the war anew. He vowed to subdue the “faithless and perjured” nation of the Saxons or destroy them forever. Summoning all the military forces of his kingdom, he invaded Saxony with an enormous army. But again the enemy would nowhere oppose the Franks in open battle; only once the Westphalians, under the lead of Witikind, risked a surprise at night. Amid terrible devastations Charles’ army pressed forward to the Oker; the tribes submitted and gave hostages. And still the subjugation of the land was not yet decided. As soon as Charles had left the land the enemy arose again in his rear and recaptured the stronghold of Siegburg.
Then the king returned in 776 with an invincible army. The Saxons immediately gave up all resistance; hardly had Charles reached the source of the Lippe when they promised to accept Christianity and submit; many immediately received baptism. Charles now had fortresses built in Saxony, took up his residence there for some time and held the “field of May” at Paderborn in 777. The nobles and the freemen of the land appeared before the mighty king on this occasion; no voice of opposition was heard, all defiance seemed broken. The Saxons vowed implicit obedience to the commands of the king, and conceded him the right, if they failed in this duty, to deprive them of land and liberty forever. The people received baptism in throngs; Saxony seemed indeed conquered. Only Witikind, in whom dwelt something of the spirit of Hermann, would not bow down to the Frank and sought refuge with the Danish king Siegfried.
Nothing tended more to hinder Charles in assuring his success in Saxony and quickly strengthening his authority there than the wars which, as ally of the pope, he had to carry on simultaneously against the Lombards. Through the divorce of his daughter, King Desiderius had become Charles’ most bitter enemy; he had joyfully received the sons of Carloman who had been excluded from the throne, had recognised them as kings of the Franks, and had demanded their anointment from Pope Adrian. But in spite of all Desiderius’ efforts to separate the pope from Charles, Adrian remained “hard as adamant”; he did not even waver when Desiderius marched against Rome with an army and took the greater part of the cities that Pepin had bestowed upon the apostolic see. The pope’s appeal for help reached Charles in 773 and he did not delay an instant to obey it. The passes of the Alps were poorly defended; Charles made his way through into the plains of Lombardy without material opposition. Here Desiderius refused to give battle in the open field and restricted himself to the defence of his cities, which had to be besieged one by one.
[774-780 A.D.]