Yi Gwal thought he was treated unfairly and received too small reward for his role in the coup. In 1624, he rebelled against Injo after being sent to the Northern front as military commander of Pyongyang to fight against the expanding Manchus, while other major leaders of the coup were rewarded with positions in the King's court. Yi Gwal led 12,000 troops, including 100 Japanese (who defected to Joseon during Japanese invasions of Korea (1592–1598)), to the capital, Hanseong, where Yi Gwal defeated a regular army under the command of General Jang Man and surrounded Hanseong in what is known as the Battle of Jeotan. Injo fled to Gongju, and Hanseong fell into the hands of the rebels.