The 13.5 cm Kanone 09 (13.5 cm K 09) was a heavy breech-loading field artillery gun used by Germany in World War I. Built by Friedrich Krupp AG, in Essen, Germany, this gun was intended to supplement the 10 cm K 04. Only four were in service at the outbreak of the war. It was withdrawn from service in 1915 as it was deemed to be too much gun for too little shell, but it was returned to service later in the war when the Allied blockade began to affect German ammunition production.
One of these guns was captured during the Battle of the Canal du Nord, on 29 September 1918, by the New Zealand Division. Two battalions of the Wellington Regiment were engaged in this action, which was part of an Allied attack on the Hindenburg Line. At the end of the war, the captured gun, Nr 4, and many other captured German weapons were sent to New Zealand as war trophies. In 1920, Nr 4 was gifted to the city of Wellington in honor of its soldiers. The gun, believed to be the only one remaining in existence, is currently on public display in the Wellington Botanic Garden.