The P-class cruisers seemed good balanced ships but the loss of Graf Spee showed the danger of concentrating the firepower on two turrets only. So the orders for two P-class ships were changed into Seydlitz-class CA successors.
The hull was taken from P-class as the nontroubled Diesel engines. A new triple turret was constructed, connecting the superior loading tech of the 11" with the excellent 8" gun. Secondairy artillery and heavy aa were combined in the new 5" twin DP turret. 4x 3,7cm unshielded twins, 5x 2cm quad and 8x 2cm single did the light aa job. 4x 3 torpedo launchers were installed amidships. Two floatplanes were stores in the hanger, one on the catapult, they proved useless, radar made targets also visible. The DPs were optical guided each director led two turrets.
'Brommy' was commissioned 1943. She operated 1944 and 45 on the french atlantic coast as flaggship for a taskforce hunting down smugglers and sometimes intruders. In march 1945 the french cruisers Duguay-Trouin, Duquesne and eight destroyers tried a raid on the taskforce stationed at La Rochelle but they were detected to soon by german radar outposts. The bold french were massacred, four destroyers managed to retreat.
In 1946 the taskforce relocated to Brest were Brommy and the other ships stayed until 1947. They brought up 197 ships of any kind in that time, just one Flottenbegleiter was lost to a lucky british torpedo.