Might as well go all the way. I want them to time travel all over the damn place.
Think about, a Terminator is sent back to medieval times, but the Resistance can't get an exact date, only a 300 year window. So they go back, knowing that they might all die of old old before the Terminator even shows up, and create a secret society to carry on the mission after they pass on. Now picture a hooded Terminator with has his face a grinning metal skull, walking calmly down a field with a claymore too heavy for any human to lift, towards a cavalry charge.
Don't tell me you don't wanna see that.