Soon after this, the Spartan king, Areus, returned from Crete with 2,000 men. These reinforcements stiffened resistance, and Pyrrhus, finding that he was losing men to desertion every day, broke off the attack and started to plunder the country. The most important Peloponnesian city after Sparta was Argos. The two chief men, Aristippus and Aristeas, were keen rivals. As Aristippus was an ally of Antigonus, Aristeas invited Pyrrhus to come to Argos to help him take over the city. Antigonus, aware that Pyrrhus was advancing on Argos, marched his army there as well, taking up a strong position on some high ground near the city. When Pyrrhus learned this, he encamped about Nauplia and the next day dispatched a herald to Antigonus, calling him a coward and challenging him to come down and fight on the plain. Antigonus replied that he would choose his own moment to fight and that if Pyrrhus was weary of life, he could find many ways to die. The Argives, fearing that their territory would become a war zone, sent deputations to the two kings begging them to go elsewhere and allow their city to remain neutral. Both kings agreed, but Antigonus won over the trust of the Argives by surrendering his son as a hostage for his pledge. Pyrrhus, who had recently lost a son in the retreat from Sparta, did not. Indeed, with the help of Aristeas, he was plotting to seize the city. In the middle of the night, he marched his army up to the city walls and entered through a gate that Aristeas had opened. His Gallic troops seized the market place, but he had difficulty getting his elephants into the city through the small gates. This gave the Argives time to rally. They occupied strong points and sent messengers asking Antigonus for help. When Antigonus heard that Pyrrhus had treacherously attacked the city, he advanced to the walls and sent a strong force inside to help the Argives. At the same time Areus arrived with a force of 1,000 Cretans and light-armed Spartans. These forces attacked the Gauls in the market place. Pyrrhus, realising that his Gallic troops were hard pressed, now advanced into the city with more troops, but in the narrow streets this soon led to confusion as men got lost and wandered around.