Hungry Seagull: "Or of course, the english Q shipping and the use of WW1 Destroyers in a convoy system to try and stave off complete starvation of the entire UK. I think at one point they were about a month left on food and POL during the war years."
You are correct. Surprising to many, German U-Boats in WWI sank significantly more shipping than German U-Boats did in WWII. Partly this was due to more scattered shipping by more combatants (French cargo ships off Africa and Asia were particularly easy prey, and Count von Luckner scuttled dozens of them without firing a shot from his sailing surface raider "Seeadler"). Britain in April, 1917 was a pretty glum, cold, hungry place, suffering an endless string of disasters on land. Then the next month America declared war on Germany.
Part of the reason German revanchism was so strong after WWI was that it was so much a very, very near run thing. Imagine your favorite football team fighting off every NFL challenger, some of them vastly better-funded and larger-market, getting to the Superbowl, suffering uncounted player injuries, leading by fifteen points with a minute to play, and then losing when the opponent makes a series of player substitutions, your waterboy trips your quarterback, your coach quits and leaves the field, and your offensive coordinator forfeits the game. That's pretty much how the Germans saw it, and it's pretty close to the truth.