The Yan general Le Yi led his troops to attack Jimo City, and Tian Single Pioneer led nearly 7,000 soldiers and civilians in the city to the city to resist the enemy, and Le Yi's onslaught did not break through in nearly a year. The reason why Tian Dan was able to withstand Le Yi's attack was because at that time, the State of Qi was practicing the five capital system. It placed the domestic military strength and economic reserves in five large cities, namely the five capitals, namely the capital cities of Linzi, Pinglu, Jimo, Gaotang, and Ju. These five places are all important military towns of the State of Qi, with sufficient food and abundant soldiers and deep pools. In particular, Jimo, located in the rich Jiaodong, was a larger city of the State of Qi, with abundant materials and a large population, with favorable defensive conditions, and Tian Dan's hands controlled at least two-fifths of the military strength of the State of Qi at that time, coupled with Tian Dan's wisdom and strategy, to temporarily resist LeYi's attack.
Le Yi saw that he could not attack for a long time, so he changed his strategy and ordered the Yan army to retreat to the Jiulian camp and surround Jimo, hoping to gain a strategy to attack the heart. In this way, a situation was formed from rout to stalemate. Tian Dan took advantage of the brief opportunity during the stalemate between the two armies to gather the soldiers and civilians in the city, rectify and expand them, and build more cities and pools to strengthen defense. He shared weal and woe with the army and the people, personally inspected the city defenses, organized his wives, concubines, and clansmen into the ranks defending the city, and personally distributed food and drinks to the soldiers and civilians guarding the city, which won the trust of the military and the people. At this moment, King Yan Zhao died, and King Hui of Yan took the throne. Hui Wang originally had a bad relationship with Le Yi. When Tian Shan heard about this incident, he wanted to replace his fierce enemy Le Yi with a counter-plot, so he sent people to sneak into the Yan state and spread rumors, saying that Le Yi was nominally attacking the State of Qi, but actually wanted to choose the opportunity to become king in the State of Qi, and now the People of Qi did not immediately agree, so they deliberately slowed down the attack on Jimo. If another person is sent, the conquest of Jimo is just around the corner. King Hui of Yan did believe that this was true, and instead sent another general to replace Le Yi.