From what I have read of your posts, you still believe the armies compassing or surrounding Jerusalem are the abomination of desolation although the word "abomination" is not used in Luke 21:20. So how do you think Luke 21:20 fits in with Matthew 24:15 with the abomination of desolation standing in "the holy place" since the area outside of Jerusalem was not considered holy which means the armies wouldn't be standing on holy ground surrounding Jerusalem if they are the abomination of desolation? The ground outside Jerusalem was considered unclean, and the Jewish people buried their dead, who were considered unclean, outside of the holy city of Jerusalem for this reason. So what do you think is 'the holy place' that the abomination would be standing in?  It can't be the temple seen in heaven coming down from heaven because the book of Revelation doesn't show it coming down from heaven as I explained in my 3/30 post to you at TO CHANCE: The Temple of God Seen In Heaven Is Not Inside New Jerusalem When It Comes Down

In my opinion, the abomination of desolation has to be more than the armies surrounding Jerusalem because other armies have invaded Jerusalem over the years before Jesus was even born and after He was resurrected according to the list of invading armies at Attacks on Jerusalem Timeline  However, the one that stands out is the invasion of Antiochus Epiphanes, the ruler of the Seleucid Empire. According to the article at Antiochus Epiphanes Profanes the Temple, 156 BC – Landmark Events "Antiochus erected an altar to Zeus on top of the altar of burnt offerings, and sacrificed a pig on December 16, 167 BC. Antiochus determined to unify the religions of the region by compelling everyone to worship him as the paramount god—the Greek god Zeus—in human form" which is something the beast (AC) in Rev. 13:4 will do. Also according to Antiochus Epiphanes "The climax of the desecrations came on Chislev 25 (16th December 167 BC), when he erected a statue of Zeus (himself!) in the temple. Then, on an altar erected on the top of the altar of burnt offering, pigs were offered to Zeus (1 Macc 1:54-61, predicted in Dan 11:31b)." However, this was only a partial fulfillment of "the abomination of desolation" because Jesus in Matthew 24:15 and in Mark 13:14 shows us that it is also a future prophecy to be fulfilled about the abomination of desolation and refers back to "the abomination of desolation" spoken of by the prophet Daniel in Daniel 11:31 & 12:11.

When the people in Judea who are outside of Jerusalem see the armies surrounding Jerusalem (Luke21:20), they should flee to the mountains along with those inside Jerusalem who see the armies in their line of vision surrounding Jerusalem, and those worshipping inside the temple, who can't see outside the temple, should flee when they see the abomination of desolation being set up or standing in the holy place inside the temple.  That is how I see Luke 21:20 & Matthew 24:15 fitting together. "The abomination of desolation standing in the holy place in Matt. 24:15 can't be ignored and left out of the picture, and the land outside Jerusalem is not considered a holy place.