On June 4th, 1645, the Congressional Army and Wang Jun fought a decisive battle near Nesby. The Congress Army concentrated 6.5438+0.4 million troops, including 65 million cavalry. Wang Jun pieced together 7,500 people, including 4,000 cavalry. The two sides still adopt the traditional way of infantry centered and cavalry flanked. At Cromwell's suggestion, in order to induce Wang Jun to fight quickly, the congressional troops retreated slightly, and Wang Jun immediately ordered the attack. At 10: 30 in the morning, Wang Jun attacked on all fronts. Rupert led the cavalry in pursuit of the left-wing cavalry of the Congressional Army. At the same time, Cromwell commanded the right-wing cavalry to rush to the left-wing cavalry in the royal army with lightning speed. The infantry of both sides also launched a decisive battle. Cromwell defeated Wang Jun's left wing, but Wang Jun's infantry attacked quickly, and the congressional infantry was forced to retreat. At this critical moment, Cromwell left a regiment to pursue the remnants of Wang Jun's left wing, and the rest of the cavalry concentrated behind the infantry in Wang Jun. Wang Jun was attacked from front to back, and suddenly it was in chaos, and soon it was defeated. The king escaped with 2000 cavalry. In this decisive battle, Wang Jun suffered casualties and captured more than 5,000 people, and all the trench, guns, arms and military flags, including the secret documents of the king, fell into the hands of the congressional army. In the three-hour battle, Wang Jun's main force suffered a devastating blow and never recovered. By March 1647, the last stronghold in Wang Jun fell into the hands of the congressional army, and the first civil war came to an end.