Early on in Book 2, before the enormous list of Greek fighters and ships, Agamemnon despairs at trying to get the Achaeans motivated to fight. In response, Athena comes down and gives Odysseus a pep talk. Afterwards, he promptly and unceremoniously takes Agamemnon's scepter out of his hands and runs around brow-beating and occasionally actually beating men who were turning from the fight. It all comes to a head when he takes the scepter and beats the crap out of the Argives' resident disfigured hunchback who was doing nothing but making jokes at the Argive leaders' expense. In fact, the narrative itself stops and mentions that the scene was so hilarious, the soldiers in-story were laughing raucously.
Menelaus beating Paris up with his bare hands, while the latter still has his sword.