Largest army

Even then,I don't think the Siege of Constantinople fits the bill either.The Ottomans definitely didn't have 300k on their side.Most sources cites somewhere along 70,000-150,000.I'd say that one of the battles from the Roman Civil Wars probably fits the bill.The battles around the period of the Tetrarchy were absolutely massive.Each side sometimes have something like over 100k.

I did not claim they have. But even going with only something like 100,000 besiegers, that's probably the largest concentration of troops for a single army in the Middle Ages in Europe.
 
I did not claim they have. But even going with only something like 100,000 besiegers, that's probably the largest concentration of troops for a single army in the Middle Ages in Europe.
The army of Frederick Barbarossa during the Third Crusade reportedly had an army over 100,000.
 
The army of Frederick Barbarossa during the Third Crusade reportedly had an army over 100,000.

Which has to be an exaggeration. Even if he could probably have supported them in the Byzantine empire, I don't think he could have assembled that large an army from Germany. The 100,000 number for the Ottomans at Constantinople is one reached when we have taken the propaganda factor into consideration.
 
I know the prompt specified army rather than navy but both the battles of Salamis and Cape Ecnomus would be largest in terms of numbers of combatants.
 
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