With the snows of the Alps melting in the spring of 1167, the spark finally came. Frederick Barbarossa, emboldened by the swelling ranks of his German knights and the support of loyalist Italian cities, marched south with banners unfurled. His target: the rebel stronghold of Alessandria, a new city founded by the League’s allies as a deliberate affront to imperial authority. The declaration of war was not delivered by parchment, but by the thunder of hooves and the glint of steel on the horizon.
At dawn, imperial cavalry swept across the fields outside Alessandria, their lances lowered, banners snapping in the wind. The city’s defenders rushed to man the ramparts, their faces streaked with sweat and fear. Arrows hissed from the battlements, striking down the first wave of attackers. The clash was immediate and brutal—men screamed as boiling oil cascaded from the walls, and the ground became slick with blood and mud. In the chaos, a breach nearly opened as imperial sappers tunneled beneath the defenses, but a desperate counterattack drove them back, leaving the air thick with the stench of burning flesh and shattered timber.
Inside the city, panic spread. Women and children huddled in churches, praying for deliverance. The city’s leaders, faces gaunt from sleepless nights, debated whether to surrender or resist. Alessandria’s refusal to yield would mark the beginning of a long and harrowing siege, setting the tone for the war to come. The emperor expected a swift victory; instead, he found his forces mired in a siege that drained both morale and supplies. Disease broke out in the imperial camp, the marshy ground breeding pestilence. Chronicles speak of fever and dysentery felling as many men as the defenders’ arrows—a grim reminder of the war’s true cost.
Elsewhere, the League’s cities mobilized. In Milan, the bells called every able-bodied man to arms. Blacksmiths labored day and night, forging pikes and crossbows, while city militias drilled in the shadow of ruined cathedrals. The countryside became a patchwork of fortified villages and watchtowers. Peasants, pressed into service or fleeing the fighting, carried news from town to town. The League’s armies moved in secret, using the rivers and forests to mask their approach. In Cremona, a band of volunteers ambushed an imperial supply column, slaughtering the guards and burning the wagons—an act of defiance that sent shockwaves through the emperor’s ranks.
The war’s early days were marked by confusion and miscalculation on both sides. Imperial commanders underestimated the resolve and ingenuity of the urban militias. League leaders struggled to coordinate their diverse forces—Guelphs and Ghibellines, merchants and nobles, all fighting for a cause but not always for the same vision of victory. Skirmishes erupted across the region: at Lodi, a bridge collapsed under the weight of fleeing soldiers; at Bergamo, a monastery was torched when imperial troops accused the monks of sheltering rebels.
Civilians bore the brunt of this chaos. Fields were trampled, livestock stolen, and entire villages put to the torch for suspected collaboration. Refugees crowded into walled towns, bringing hunger and disease in their wake. Chroniclers record mass graves hastily dug outside city gates, the dead laid out in rows as a warning to those who would challenge imperial might. The war’s brutality was not confined to the battlefield—it seeped into every crevice of daily life.
Yet for all the suffering, hope flickered. The League’s defiance inspired uprisings in other cities, drawing new allies into the fold. Messengers slipped through enemy lines, carrying news of Alessandria’s stand and Milan’s rebirth. The emperor’s promise of swift victory faded with each passing day.
As the siege of Alessandria dragged on, Frederick’s frustration mounted. Reports of desertion and mutiny reached his tent. The emperor’s gamble had failed to cow the League into submission; instead, it had united them in resistance. The war was no longer a matter of honor or prestige—it was a battle for survival, fought in the mud and blood of Lombardy’s fields.
The city of Alessandria held. The League’s banners still flew above its battered walls. The conflict had begun in earnest, and there would be no turning back. As the first snows of winter dusted the plains, both sides dug in for a long and bitter struggle.