"And when the dragon saw that he had been thrown to the earth, he pursued the woman who had given birth to the male child. But the woman was given two wings of a great eagle to fly from the presence of the serpent to her place in the wilderness, where she was nourished for
a time, and times, and half a time."
In Revelation 12, Satan and his angels being cast out of heaven and restricted to the earth is the result of the 7th trumpet. When Satan is cast to the earth, the woman/Israel flees into the wilderness where she is cared for, for 1260 days, which puts Satan and his angels being cast out as taking place from the middle of that seven year period and covers the last 3 1/2 years. Therefore, since the 7th trumpet takes place in the middle of the seven years, then the previous seals and other six trumpets would have to take place during the first 3 1/2 years.
It's elementary my dear Watson