The siege failed and Polyperchon lost a lot of prestige, which was capitalized on by Cassander and his ally Antigonus.
Polyperchon left the siege of Munychia and Pireaus to a subordinate and marched his main army into the Peloponnese.
When Polyperchon arrived at Megalopolis he established two camps in front of the city, one for his Macedonian troops, one for his allies.
The defenders were able to hold the breaches and after a lot of hard fighting the attackers withdrew with heavy losses.
When the elephants reached the stockades they tried to rip them down, but because of the spikes, hooks and nails they hurt their trunks, then panicked and fled.
Eventually Cassander was able to drive Polyperchon from Macedon and became the dominant power in the European part of the Macedonian Empire.