in the days immediately following the second battle of fort wagner, union forces besieged the confederate works on morris island with an array of military novelties. union gunners made use of a new piece of artillery known as the requa gun—25 rifle barrels mounted on a field carriage. while sappers dug zig-zag trenches toward fort wagner a second novelty was used—the calcium floodlight. bright lights were flashed upon the defenders, blinding them enough to decrease accurate return fire while the union gunners fired safely from behind the lights