The battles of the Civil War may be the most memorable images of the struggle, but there was more to the war than massed lines of hundreds of thousands of infantry. Important naval battles along the Confederacy's rivers and coastal waters were hugely important in the outcome of the Civil War. And because the Confederacy was so vast, guerrilla actions by Southerners — uniformed and not — harassed Northern forces. Confederates also worked to carry out sabotage in Northern cities.