As you left us last time Milan had stormed Bologna but the Milanese army was trapped in the city by the Bolognese relief army that arrived just too late.
Meanwhile the Genoese had advanced to the outskirts of Milan and faced a much smaller Milanese army. If Milan lose to Genoa their armies will be trapped in 2 cities and doomed to lose the war. But if they can beat Genoa decisively then they can relieve the trapped army in Bologna and win the war. They need to be quick the Pope is from Bologna and war with his home city will get Milan excommunicated.
All is set for a decisive battle.