Charleston with 2,000 British forces to relieve the siege. The next day, Pickens and Lee arrived, having successfully captured Augusta on June 6. Greene did not learn of Rawdon's move until June 11. With the situation becoming critical, Greene decided to try an assault on the fort. (Cruger learned of Rawdon's approach the next day when the messenger, posing as a Patriot, got close enough to the fort to race the remaining distance on his horse.) Assault Greene planned to have one party capture the smaller redoubt, while a larger attack force went after the Star Fort, where some men would pull down the sandbags to expose the defenders to fire from the tower. When the attack began on June 18, all went to plan at first—the smaller redoubt was taken, and men successfully penetrated the abatis and pulled down the sandbags. At this point, Cruger launched a counterstrike with a pair of sorties to strike at the flanks of the attacking party. In a fierce battle dominated by bayonets and the use of muskets as clubs, the leaders of the attack were killed and their men forced to retreat back to their trenches. With the failure of the attack, and Rawdon only away, Greene called off the assault and ordered a retreat. "My men did horrible and some will be shot" Aftermath Greene's losses amounted to 150 men, while Cruger's casualties were under 100. Greene retreated toward Charlotte, North Carolina, allowing Rawdon to join forces with Cruger. Rawdon sent a sizable force after Greene, but heat and the toll of the long forced marches slowed them. The force was recalled to Ninety Six, which Rawdon then abandoned. General Greene blamed the failure of the operations against Ninety Six in part on Sumter and Marion, who failed to act in support of his operations in a timely manner. Later, other officers blamed Greene and Lee for failing to cut off the defenders' water supply at the Spring Branch. Writing in his memoirs, Lee singled out Col. Kosciuszko for much of the defeat. He believed the engineer began the first parallel too close to the Star Fort, as well as underestimating the lengthy amount of time his undermanned and ill-equipped sappers needed to excavate the rock-hard soil enough to make a trench to support the siege. Though these issues contributed to the failure of the operation as a whole, Greene commended