The flag march was one of the lightning bolts that triggered the 2021 battle in the Palestinian territories. It is an annual tradition associated with the so-called "Jerusalem Day", an Israeli national holiday that was established in 1968.
The story of the flag march dates back to the first anniversary of the Israeli occupation of East Jerusalem in 1967, when some members of the extreme right in 1968, on their own initiative, marched in East Jerusalem while carrying Israeli flags. This tradition has since taken on the character of a national celebration of the "unification of the two parts of Jerusalem"