sentences:  After the guns were fired, each barrel had to be cleaned.Unlike small caliber guns which can be field-stripped, the guns aboard an "Iowa"-class battleship could not be disassembled, so the gunners mates assigned the job of cleaning them required a full day or more to ensure that the barrels were correctly and adequately cleaned.To clean the barrels, a bore brush was lifted by two sailors and inserted into the gun barrel, where it was pulled through with the same equipment used to load the shells.