The Aetolian League hampered AntigonusII's control over central Greece, and the formation of the Achaean League in 251BC pushed Macedonian forces out of much of the Peloponnese and at times incorporated Athens and Sparta.; see also about the resurgence of Sparta under Areus I. While the Seleucid Empire aligned with Antigonid Macedonia against Ptolemaic Egypt during the Syrian Wars, the Ptolemaic navy heavily disrupted AntigonusII's efforts to control mainland Greece.; . With the aid of the Ptolemaic navy, the Athenian statesman Chremonides led a revolt against Macedonian authority known as the Chremonidean War (267–261BC).; . By 265BC, Athens was surrounded and besieged by AntigonusII's forces, and a Ptolemaic fleet was defeated in the Battle of Cos. Athens finally surrendered in 261BC.; . After Macedonia formed an alliance with the Seleucid ruler Antiochus II, a peace settlement between AntigonusII and Ptolemy II Philadelphus of Egypt was finally struck in 255BC..
The Aetolian League hampered AntigonusII's control over central Greece and the formation of the Achaean League in 251BC pushed Macedonian forces out of much of the Peloponnese and at times incorporated Athens and Sparta; see also about the resurgence of Sparta under Areus I While the Seleucid Empire aligned with Antigonid Macedonia against Ptolemaic Egypt during the Syrian Wars the Ptolemaic navy heavily disrupted AntigonusII's efforts to control mainland Greece;  With the aid of the Ptolemaic navy the Athenian statesman Chremonides led a revolt against Macedonian authority known as the Chremonidean War (267–261BC);  By 265BC Athens was surrounded and besieged by AntigonusII's forces and a Ptolemaic fleet was defeated in the Battle of Cos Athens finally surrendered in 261BC;  After Macedonia formed an alliance with the Seleucid ruler Antiochus II a peace settlement between AntigonusII and Ptolemy II Philadelphus of Egypt was finally struck in 255BC