After the armistice of 1919 the exhausted parties began to shrink their fleets. Most of the prewar ships were scrapped, some ships of good condition were converted. The germans had further problems with uprisings within the navy, some ships were abandoned.
The light cruiser Cöln was on its way to the western african coast to support the troops there. When it returned to Wilhelmshaven in spring 1920 it was the first ship to set up the flag of the new formed constitutional monarchy, a new kaiser was still to be elected.
The Cöln was turned into a testbed for a new triple 6" turret, it was first installed at the a-position only. Further the coal fire boilers were replaced by oil fired boilers. The funnels were later replaced by two bigger funnels. The old 8,8cm aa were removed, as were the 50cm-torps.
As the first 6"-turret had be replaced due to a minor construction fault, the 'Cöln' made a journey from Kiel to Wilhelmshaven were she made some awesome 38 knots. No wonder, she was stripped from almost all weapons and equipped with brand new engines.
In 1937 the sign were pointing to war again. The german government was led by falcons, the flags with the swastika flooded the Reich. And enormous streams of money were led into rearmament. New ships were designed and ordered in obscure masse, older ships were brought to modern standards. One of them was the light cruiser Cöln.
The aft area was reconstructed similiar to the K-class light cruisers, but with the turrets on line. Four 8,8cm aa were installed between the funnels and 53,3cm triple torps were installed at the old positions. A 'Seetakt' radar was added and the main gun directors were replaced by new 7m with enhanced night googles. On trials in April '39 the 'Cöln' made a journey through the channel to Brest. In july '39 she made a trip to Danzig until the outbreak of war. In august '39 she met the polish destroyer Błyskawica at the Baltic Sea and was able to sink it. Later the day she lost her bow to a mine the Błyskawica had layed shortly before her end.
The 'Cöln' made it back to Danzig were she was layed up until 1943. Her fate at the invasion in 1946 will follow with a new drawing.
Thanks to WhyMe for the original Cöln.