How was van dorn able to bring grant to a standstill and allow pemberton to defeat sherman?

Van Dorn was able to bring Grant to a standstill by executing a series of strategic maneuvers that disrupted Union supply lines and communications. By launching surprise attacks and utilizing guerrilla tactics, he effectively diverted Grant's attention and resources. This created an opportunity for Confederate General John Pemberton to regroup and counter Sherman’s advances. Pemberton's ability to exploit the confusion caused by Van Dorn's actions allowed him to achieve victories and delay Sherman’s campaign further.