My computers left a considerable army in the garrisons. Fedya brought them back with significant losses. Vulnerable heroes would have been defeated without a chance. I played through the campaign as a hero. I was too lazy to recruit machines from the witch. But I also restarted the mission several times – I tried to find Ossir in the tavern. Fedya needs archers. He tore through everyone in the following missions, even without the machines. Some problems only occurred in the 2nd mission. There, I also tried to find Ossir in the tavern.