 In the early evening of 15 June , Webb began his next attempt by passing over the lower obstructions in the Wilmington River and spent the rest of the night coaling . He moved forward the next evening to a concealed position within easy reach of the monitors for an attack early the following morning . Webb planned to sink one of the monitors with his spar torpedo and then deal with the other one with his guns . The gunboat <unk> and the tugboat <unk> were to accompany him to tow one or both of the monitors back to Savannah . 
