Kolokotronis, convinced that he was correct, moved into Arcadia with 300 Maniots. When he entered Arcadia his band of 300 fought a Turkish force of 1,300 men and defeated them. On April 28, a few thousand Maniot soldiers under the command of Petros Mavromichalis' sons joined Kolokotronis' camp outside Tripolitsa. On September 12, 1821, the Turkish capital in the Peloponnese fell. On July 4, 1822, Kyriakoulis Mavromichalis, Petros Mavromichalis' younger brother, was killed in Splantza, near the Souliote fortress of Kiafa.