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It will never be the same - some details to keep in mind
Time travelling stories are bloody tricky business. Avoiding obvious paradoxes are nigh impossible.
Here are some things that always bug me with time travelling in movies.
1. The moment they show up in the past they start to affect things. You need to invent an excuse for why the time travellers themselves don't change when they go back. Like "When you do this you might never see your family again, because they might not exist. Probably wont in fact. The time travels will in some respects remove you from the effect of the causality line. You will rewrite history, you won't disappear if you change it so you will never be born though. You will overwrite history, but that doesn't mean it never happened. Just like the file on a data disk that gets over written didn't not exist before it was over written."
2. The time machine needs to be something they take with them, otherwise it probably won't exist to pull them back.
3. If they change things back, remember that it can never become exactly the same. They are from nearly 400 years into the future, any small difference, however small, they achieve by simply being there will have had time to diverge and make it a big difference. Some of the soldiers might return and not have a family, and in case they do exist in the future, there would be another, different, them.
4. Remember that unless they kill their former selves (why) when they go to stop them, there will be two of each of them.