When Was Zechariah 10:10 Fulfilled?
Sources, Wikipedia, Brittanica, google. The Bible.
The Ten Tribes
https://en.wikipedia.org/wiki/Ten_Lost_Tribes
The ten lost tribes were the ten of the Twelve Tribes of Israel that were said to have been exiled from the Kingdom of Israel after its conquest by the Neo-Assyrian Empire circa 722 BCE.[1][2] These are the tribes of Reuben, Simeon, Dan, Naphtali, Gad, Asher, Issachar, Zebulun, Manasseh, and Ephraim; all but Judah and Benjamin
The Assyrian Empire
https://en.wikipedia.org/wiki/Assyria#Neo-Assyrian_Empire
The Neo-Assyrian Empire is usually considered to have begun with the ascension of Adad-nirari II, in 911 BC, lasting until the fall of Nineveh at the hands of the Medes/Persians and Babylonians, Chaldeans in 609 BC.[82]
Babylon
https://www.britannica.com/place/Babylon-ancient-city-Mesopotamia-Asia
After a Hittite raid in 1595 BCE, the city passed to the control of the Kassites (c. 1570), who established a dynasty lasting more than four centuries. Later in this period, Babylon became a literary and religious centre, the prestige of which was reflected in the elevation of Marduk, its chief god, to supremacy in Mesopotamia. In 1234 Tukulti-Ninurta I of Assyria subjugated Babylon, though subsequently the Kassite dynasty reasserted itself until 1158, when the city was sacked by the Elamites. Babylon’s acknowledged political supremacy is shown by the fact that the dynasty of Nebuchadrezzar I (1124–03), which endured for more than a century, made the city its capital, though the dynasty did not originate there.
Persia
https://en.wikipedia.org/wiki/Achaemenid_Empire
The Achaemenid Empire (/əˈkiːmənɪd/; Old Persian: 𐎧𐏁𐏂, romanized: Xšāça, lit. 'The Empire'), also called the First Persian Empire,[15] was an ancient Iranian empire that was based in Western Asia and founded by Cyrus the Great in 550 BC. It reached its greatest extent under Xerxes I, who conquered most of northern and central ancient Greece, including the city of Athens, in 480 BC. At its greatest territorial extent, the Achaemenid Empire stretched from the Balkans and Eastern Europe in the west to the Indus Valley in the east. The empire was larger than any previous empire in history, spanning a total of 5.5 million square kilometers (2.1 million square miles).[11][12]
How was Babylon destroyed?
https://www.google.com/search?q=when+babylon+was+destroyed&oq=Babylon+when&aqs=chrome.1.0i512j0i22i30l9.8802j0j7&sourceid=chrome&ie=UTF-8
In 539 BC, the Neo-Babylonian Empire fell to Cyrus the Great, king of Persia, with a military engagement known as the Battle of Opis. Babylon's walls were considered impenetrable. The only way into the city was through one of its many gates or through the Euphrates River.
As you will read from above Assyria was destroyed by the Babylonians under King Nebuchadnezzar and in turn, Babylon was brought down by Cyrus the Great of Persia.
Cyrus’ Proclamation:
Cyrus' proclamation was made in 538 BC, in the first year as King of Babylon, this ended the Jewish exiles, and allowed them, mainly from Babylon, but also Egypt, Assyria, and other regions of the Persian Empire to return to Jerusalem. This is the Fulfilment of the prophecy at Zechariah 10:10 This also marked the end of the prophesied 70 years of Judah’s desolation. 2Chronicles 36:20- 21.
The Degree.
Ezra 1:1-4 ASV
1 Now in the first year of Cyrus king of Persia, that the word of
Jehovah by the mouth of Jeremiah might be accomplished, Jehovah
stirred up the spirit of Cyrus king of Persia, so that he made a
proclamation throughout all his kingdom, and put it also in writing,
saying, 2 Thus saith Cyrus king of Persia, All the kingdoms of the
earth hath Jehovah, the God of heaven, given me; and he hath charged
me to build him a house in Jerusalem, which is in Judah.3 Whosoever
there is among you of all his people, his God be with him, and let him
go up to Jerusalem, which is in Judah, and build the house of Jehovah,
the God of Israel [b](he is God), which is in Jerusalem. 4 And
whosoever is left, in any place where he sojourneth, let the men of
his place help him with silver, and with gold, and with goods, and
with beasts, besides the freewill-offering for the house of God which
is in Jerusalem.