All the suitors are in the great hall waiting angrily after being told about the competition to win Penelope's hand in marriage. They don't think that this "competition" is a fair way of seeing who gets to marry Penelope
Odysseus shows up in the great hall disguised as an old beggar, and the other suitors say he shouldn't be there because he is just a poor old man. The suitors think he shouldn't be allowed to compete for Penelope's hand in marriage.
All the suitors try their hand at stringing the bow; and none of them are able to do it. They say its impossible, and get really frustrated.
After some convincing, Odysseus is handed the bow and easily strings it. As all the suitors are gawking at Odysseus, he lines up the arrow, draws back and shoots it through all twelve axes, and hits the target.
Odysseus is transformed back into himself, as soon as he hits the target with the arrow. All the suitors get really angry, and make attempts to kill Odysseus.
Odysseus lets out all his anger towards the suitors for all the wrong they've done, and he kills all of them.