Periclean strategy
The Spartan army was at this time gathered at Corinth, and, citing this as a hostile action, the Athenians refused to admit their emissaries. With his last attempt at negotiation thus declined, Archidamus invaded Attica, but found no Athenians there; Pericles, aware that Sparta's strategy would be to invade and ravage Athenian territory, had previously arranged to evacuate the entire population of the region to within the walls of Athens.
No definite record exists of how exactly Pericles managed to convince the residents of Attica to agree to move into the crowded urban areas. For most, the move meant abandoning their land and ancestral shrines and completely changing their lifestyle. Therefore, although they agreed to leave, many rural residents were far from happy with Pericles' decision. Pericles also gave his compatriots some advice on their present affairs and reassured them that, if the enemy did not plunder his farms, he would offer his property to the city. This promise was prompted by his concern that Archidamus, who was a friend of his, might pass by his estate without ravaging it, either as a gesture of friendship or as a calculated political move aimed to alienate Pericles from his constituents.

In any case, seeing the pillage of their farms, the Athenians were outraged, and they soon began to indirectly express their discontent towards their leader, who many of them considered to have drawn them into the war. Even when in the face of mounting pressure, Pericles did not give in to the demands for immediate action against the enemy or revise his initial strategy. He also avoided convening the ecclesia, fearing that the populace, outraged by the unopposed ravaging of their farms, might rashly decide to challenge the vaunted Spartan army in the field. As meetings of the assembly were called at the discretion of its rotating presidents, the "prytani" (singular, "prytaneis"), Pericles had no formal control over their scheduling; rather, the respect in which Pericles was held by the prytanies was apparently sufficient to persuade them to do as he wished. While the Spartan army remained in Attica, Pericles sent a fleet of 100 ships to loot the coasts of the Peloponnese and charged the cavalry to guard the ravaged farms close to the walls of the city. When the enemy retired and the pillaging came to an end, Pericles proposed a decree according to which the authorities of the city should put aside 1,000 talents and 100 ships, in case Athens was attacked by naval forces. According to the most stringent provision of the decree, even proposing a different use of the money or ships would entail the penalty of death. During the autumn of 431 BC, Pericles led the Athenian forces that invaded Megara and a few months later (winter of 431–430 BC) he delivered his monumental and emotional Funeral Oration, honoring the Athenians who died for their city.

Last military operations and death: For heroes have the whole earth for their tomb; and in lands far from their own, where the column with its epitaph declares it, there is enshrined in every breast a record unwritten with no tablet to preserve it, except that of the heart.
In 430 BC, the army of Sparta looted Attica for a second time, but Pericles was not daunted and refused to revise his initial strategy. Unwilling to engage the Spartan army in battle, he again led a naval expedition to plunder the coasts of the Peloponnese, this time taking 100 Athenian ships with him. According to Plutarch, just before the sailing of the ships an eclipse of the sun frightened the crews, but Pericles used the astronomical knowledge he had acquired from Anaxagoras to calm them. In the summer of the same year an epidemic broke out and devastated the Athenians. The exact identity of the disease is uncertain; typhus or typhoid fever are suspected, but this has been the source of much debate. In any case, the city's plight, caused by the epidemic, triggered a new wave of public uproar, and Pericles was forced to defend himself in an emotional final speech, a rendition of which is presented by Thucydides. This is considered to be a monumental oration, revealing Pericles' virtues but also his bitterness towards his compatriots' ingratitude. Temporarily, he managed to tame the people's resentment and to ride out the storm, but his internal enemies' final bid to undermine him came off; they managed to deprive him of the generalship and to fine him at an amount estimated between 15 and 50 talents. Ancient sources mention Cleon, a rising and dynamic protagonist of the Athenian political scene during the war, as the public prosecutor in Pericles' trial.

Nevertheless, within just a year, in 429 BC, the Athenians not only forgave Pericles but also re-elected him as strategos. He was reinstated in command of the Athenian army and led all its military operations during 429 BC, having once again under his control the levers of power. In that year, however, Pericles witnessed in the epidemic the death of both Paralus and Xanthippus, his legitimate sons from his first wife. His morale undermined, overwhelmed with grief, Pericles wept copiously for his loss and not even the companionship of Aspasia could console him. He himself died of the plague later in the year.
Just before his death, Pericles' friends were concentrated around his bed, enumerating his virtues during peace and underscoring his nine war trophies. Pericles, though moribund, heard them and interrupted them, pointing out that they forgot to mention his fairest and greatest title to their admiration; "for", said he, "no living Athenian ever put on mourning because of me". Pericles lived during the first two and a half years of the Peloponnesian War and, according to Thucydides, his death was a disaster for Athens, since his successors were inferior to him; they preferred to incite all the bad habits of the rabble and followed an unstable policy, endeavoring to be popular rather than useful. With these bitter comments, Thucydides not only laments the loss of a man he admired, but he also heralds the flickering of Athens' unique glory and grandeur.
Pausanias (c. 150 AD) records (I.29) seeing the tomb of Pericles along a road near the Academy.

Personal life: For men can endure to hear others praised only so long as they can severally persuade themselves of their own ability to equal the actions recounted: when this point is passed, envy comes in and with it incredulity.
Pericles, following Athenian custom, was first married to one of his closest relatives, with whom he had two sons, Paralus and Xanthippus, but around 445 BC, Pericles divorced his wife. He offered her to another husband, with the agreement of her male relatives. The name of his first wife is not known; the only information about her is that she was the wife of Hipponicus, before being married to Pericles, and the mother of Callias from this first marriage.
After Pericles divorced his wife, he had a long-term relationship with Aspasia of Miletus, with whom he had a son, Pericles the Younger. While Aspasia was held in high regard by many of Athens' socialites, her status as a non-Athenian led many to attack their relationship. Even Pericles' son, Xanthippus, who had political ambitions, did not hesitate to slander his father. Nonetheless, such objections did not greatly undermine the popularity of the couple and Pericles readily fought back against accusations that his relationship with Aspasia was corrupting of Athenian society.
His sister and both his legitimate sons, Xanthippus and Paralus, died during the Plague of Athens. Just before his death, the Athenians allowed a change in the law of 451 BC that made his half-Athenian son with Aspasia, Pericles the Younger, a citizen, and legitimate heir, a striking decision considering that Pericles himself had proposed the law confining citizenship to those of Athenian parentage on both sides.

Assessments: Pericles marked a whole era and inspired conflicting judgments about his significant decisions. The fact that he was at the same time a vigorous statesman, general and orator only tends to make an objective assessment of his actions more difficult.

Political leadership: Some contemporary scholars call Pericles a populist, a demagogue and a hawk, while other scholars admire his charismatic leadership. According to Plutarch, after assuming the leadership of Athens, "he was no longer the same man as before, nor alike submissive to the people and ready to yield and give in to the desires of the multitude as a steersman to the breezes". It is told that when his political opponent, Thucydides, was asked by Sparta's king, Archidamus, whether he or Pericles was the better fighter, Thucydides answered without any hesitation that Pericles was better, because even when he was defeated, he managed to convince the audience that he had won. In matters of character, Pericles was above reproach in the eyes of the ancient historians, since "he kept himself untainted by corruption, although he was not altogether indifferent to money-making".