During its existence, several improvements were made to the fort, including reinforcing the stockade and making it higher, extending the fort to a nearby bluff to provide cover from below, and constructing of additional blockhouses outside the stockade. These improvements could not fully compensate for the poor location of the fort, however, and it was again attacked in March 1812, and was the focus of a coordinated siege in the following September. The September siege was intense, and the fort was nearly overrun. Significant damage resulted to fort-related buildings, and the attack was only stopped when cannon fire destroyed a fortified Indian position. Black Hawk participated in the siege, and claimed to have personally shot the fort's flag down.