There are many possible answers regarding this topic, but by following the sources we could analyze the possible number of troops that were fighting in a single battle during the medieval period.
Comparing the medieval period with the ancient period, a lot of things have changed in the battlefield. In the ancient period the army was more professional and because of this, the size of the force could be big in numbers. While looking back at the medieval period the army wasn’t so professional, this was one of the reasons for the medieval period battles to have much lower number in troops.
Which Armies Were the Largest?
First of all this is really hard to answer because the numbers could always be exaggerated. Starting from the hundred years war France called up to 50 000 – 60 000 soldiers, even though they weren’t stationed into one place there was a single unit with around 25 000. While England had around 30 000 soldiers. If they clashed the number would have been around 50 000 – 60 000 and this would make it become a huge fight.
Also it’s worth mentioning the Holy Roman empire had around 80 000 – 100 000 soldiers before he died in the Third Crusade. This is a huge number and this force could cause some serious damage if it was deployed in the east. There are also other worthy mentions, but the number wouldn’t get higher.