Today was a Yom Tov, celebrating the conquering of the city walls of Shomron-Samaria.
The 70 years of exile only finished a few years later when King Darius the Persian, allowed the reconstruction of the Beis HaMikdash.
Contrary to popular belief, Jerusalem, wasn’t always the capital of Israel. Jerusalem was the capital of Yehuda-Judea, whilst Samaria was actually the capital of Israel.
Source: Megillas Taanis