The Panzer-Lehr-Division was meant for Western Europe to help defend against possible Allied landing. They never make it and are now thrusted into a new war not of their choosing. Trust and Loyalty are tried in Blood and Steel.
Equestria is fighting her first World War after the 2nd Industrial revolution. She hasn't fought a war in a while. Before his death, Discord enlists the help of several creatures that are all too familiar with the concept.
Octavia and Vinyl live different lives in Canterlot, but they will soon escape the White City to try and make new lives in Manehattan. But the lives they're gonna get are far from what they imagined.