The improved O/400 began entering service in April 1918, gradually allowing the re-equipment of more squadrons. The O/400s could carry the new bombs, which were aimed with the Drift Sight Mk 1A bombsight. Each raid was conducted by up to forty O/400s. On the night of 21/22 October, four Handley Pages attacked Kaiserslautern with heavy bombs and four dropped incendiaries. Three heavy bombers and two incendiary bombers caused M500,000 of damage and Kaiserslautern was bombed again on 23/24 October, along with Coblenz, Mannheim and Wiesbaden. The bombers were again diverted to army support during the month, and on the night of 9/10 October, 97, 215 and 216 Squadrons bombed Metz, one bomb hitting a powder store and rocked the town, the damage being estimated by the Germans at M1,000,000. Operations were reduced during the last days of the war by weather but several aerodromes were attacked, particularly that at Morhange.