1757, 22 June 1916, SMS Roon, North Sea
Kapitän zur See Wilhelm von Karpf had rung up full speed. He was willing to admit to himself that he had been unnerved by 15 inch shells weighing a ton dropping around his lightly armed armoured cruiser. Roon had missed her turn and had come under fire, finding herself at the rear of the High Seas Fleet main battle line, not a place he desired to be, especially with the order of advance reversed after the battle turn and the ships of Roon's, nominal command, IInd Squadron, now leading the High Seas Fleet at their best speed of 16.7 knots. Roon had surged ahead, making fully 20.1 knots as she clawed her way past SMS Konig and her Division, no longer maintaining line ahead as she raced to rejoin her Division mates in the van. Von Karpf had received no such instructions, but had not been told not to do so either and the idea of trailing at the rear of the formation was anathema to him. There was no going back. Hessen was gone, her funeral pyre still in his memory. Two ship's gone in a matter of minutes.
Deep in the engine room, stokers laboured to gain every last ounce of steam from the old ship. Von Karpf respected his stokers. They could save his ship; they could save his life for that matter. Contrary to popular opinion, it was a skilled occupation. Coal was fed by hand - a man with a shovel. This position was hot, incredibly dirty and completely physically exhausting. Yet, it was also a job demanding the highest skill. One could not just shovel coal into the furnace and expect the ship’s boilers to function efficiently. Boilers were complex devices, expensive and fragile. Roon was built for speed, with 16 complex water-tube boilers to make her 20-21 knot speed, fast for her time. This required a crew of over 600, many of them stokers. Stoking was an art of it's own, if done properly. In order to get the maximum speed and efficiency from a boiler, i.e. the most energy transfer from the coal to the water, a stoker needed to spread the coal evenly with the shovel across the gratings, at the same time pushing ash off into the pans so as to not reduce the temperature, keeping the heat up at a specific level, spread evenly across the water tubes that passed through the firebox, so as to generate steam. Too hot in one spot and you could break a tube. There were hundreds of these in a large ships’ boilers. Each leaking tube slowed down the ship, costing time, expertise and money to replace.