UPDATE:
-> Germany campaign mission 3
In the default mission, when you exit the Steiner's office after his death, almost everything inside the factory explode without the player participation. In the result, you could complete one of the 2 mission objectives very easy. Now, you will need to destroy archives in Steiner's office (9 book shelfs, placed in groups of 3), two wagons with white boxes on it, locomotive and all trucks, to achieve this goal. You could find 8 time bombs (which is enough) in the explosives storage place. Now, the player has an open access to explosives storage place and it is surrounded by a metal fence like it was before. By the way, the narrator in the briefing told us, that we could use those explosives, so why not use them? When you destroy all the needed stuff (you will hear short music track confirming that), head to the factory's exit and that concludes the mission. I think, that now the mission is much more realistic than before.
NOTE: You could destroy each group of book shelfs by placing one timed bomb in the middle of it (so you need 3 bombs).
The mission folder is inside the *.rar archive, open it using Winrar and unpack to your H&D directory, then open your missions.dta file and delete that mission so the game will upload only the new one.
If you downloaded my edited missions, please post a comment here! I am waiting your feedback. 
"Who Dares Wins" - SAS motto.