Smoke is spotted to the South and within minutes the German steamer Graf von Gotzen and her consort, the Kingani, hove into view, under the command of Gustav Zimmer Their mission, to stop the supplies from getting though.
The range closes, and Gotzen's next broadside scores two good hits. Delommune loses her heavy gun, more hull damage, and a hit to the boiler room which halves her speed. But from the Wast is heard the sound of petrol engines, as two British motor boats, Mimi and Toutou, speed in to draw the German fire.
The British boats can only fire forwards so they speed past the German raider, their machine guns blazing but no damage caused. Both boats turn tightly and form up on her stern. Gotzen administers the coup de grasse on poor Delcommune, as her last hull points are shot away and the Belgian is in a sinking condition. The civilians on the steamers expect the worst, but fire from the British boats disables Gotzen's 88mm gun. Meanwhile Kingani and Netta trade shots, causing minor damage.
Gotzen switches targets to the annoying British motor boats, but they are small targets head on and very difficult to hit. Gotzen is not, and the British score more hits, causing a minor flood but more importantly disabling Gotzen's 37mm guns (she can still use rifles and machine guns).
Zimmer realises that intercepting this cargo requires too high a price. With all his main guns disabled or with their crews wounded and out of action, and with the British boats seemingly able to lob 3pdr Hotchkiss shells into him with near impunity he decides of break off the action. As Gotzen raises steam to disengage a Short seaplane makes its appearance and executes an almost perfect bomb run - but its bombs land either side of Gotzen which is doused in spray but otherwise unaffected.As the Gotzen and Kingani leave the field the civilian steamers pick up the survivors from the Delcommune, whilst the British muse on the fact that they disabled Gotzen's last operational gun with their final round of ammunition.......