Daniel 9:27 KJV
And he (Christ) shall confirm the covenant (Abrahamic) with many (Children of Abraham) for one week: and in the midst of the week he (Christ) shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he (Christ) shall make it desolate ("Behold, your house is left unto you desolate."), even until the consummation, and that determined shall be poured upon the desolate.
This is all things Christ did aren't they?
And he (Christ) shall confirm the covenant (Abrahamic) with many (Children of Abraham) for one week: and in the midst of the week he (Christ) shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he (Christ) shall make it desolate ("Behold, your house is left unto you desolate."), even until the consummation, and that determined shall be poured upon the desolate.
This is all things Christ did aren't they?
If THE MESSIAH is detained 21 days, and no one helps HIM but Michael the TRUE PRINCE of DANIEL's people, who do Daniel's people need to be protected from.
and where is THE MESSIAH?
You should refer to 2 thesselonians 2 to understand that in order for the "prince of the people to come" to be revealed HE who holds all things back has to be taken out of the way.
Hence, HE is detained 21 days and no one helped HIM but MICHAEL, the warring angel (which is also clearly stated in Daniel 10)