The Battle of Staten Island was a raid by Continental Army troops under General John Sullivan against British positions on Staten Island on August 22, 1777, during the American Revolutionary War. British General Howe had recently sailed away from New York City with most of his troops, leaving their position on Staten Island vulnerable. Sullivan's raid was well-executed, but it suffered from a shortage of boats to effect the crossing, and one of its detachments was misled by its guide to the front of the enemy position rather than its rear. As a result, Sullivan did not take as many prisoners as expected, and had more than 200 of his own men taken prisoner due in part to the lack of boats to effect a timely retreat. While Sullivan, as a consequence of the timing of this action, was accused of tardiness in responding to an order by General George Washington to prepare his troops for a march to Philadelphia, a court martial held later in 1777 exonerated Sullivan on all charges.