https://m.fanfiction.net/s/11981213/1/I-ll-Catch-a-Break-Someday
Summary:
The Promised Day did not end as anyone had expected: Al's seal broke; Ed defeated Father but at a cost. With what strength there was left, Ed performed the ultimate sacrifice for Al. Who knew that meant getting thrown onto Earth in 1943? Nazis? Hydra? A super soldier? The Gate has a sick sense of humour... Fem!Ed Genderfluid!Ed
Review:
Brotherhood ending, but Ed got hurt and was about to die when the gate put him in Germany, in a doctors home. Ed survived and ends up being best friends with Steve Rogers. You can guess the rest. The author hasn't updated in a few months though, and the last chapter is when captain America and his team are taking out hydra bases.