Originally Posted by
Lord Oda Nobunaga
Assyria is kind of a complicated subject because I don't think there is another empire that had so many resurgences and then ran back to hide in their corner. The original rise of Assyria happened during the 1200's BC as a result of the power vacuum caused by the Mitanni civil war against Tushratta, which also led to the conquest of Mitanni by the Hittite ruler Suppiluliumas.
Assyria was not strong in the 1300's BC but as vassals of Mitanni they helped prop up the rebel regime of Artatama II and Shuttarna III. When the Hittites crossed the Euphrates, the Assyrians (ruled by Ashur-uballit I) were not willing to fight them and they made a strategic withdrawal towards the Tigris. Suppiluliumas put Shattiwaza into power as his vassal. Even after the death of Suppiluliumas and his sons, the younger son Mursili II inherited the throne and he was able to defeat an incursion of the Assyrians against Carchemish, despite being hard pressed by the Luwians and Kaskans in Anatolia.
In the 1200's BC the Hittites were hard pressed due to domestic troubles as well as wars with all of their neighbors. In particular the incursions by the northern Kaska tribes, the Egyptians of the 19th Dynasty, the Ahhiyawans of the west, the Luwian coalition against the Hittites. During the reigns of Muwatallis II and his brother Hattusili II the Assyrians under Adad Nirari I invaded Mitanni. Although it appears that Adad Nirari was not strong enough to actually fight the Hittites, he was able to take most of Mitanni while the Hittites were busy fighting in other places. Adad Nirari kept the Mitanni king Shattuara as a vassal.
However when Wasashatta become king he rebelled against the Assyrians and was quickly put down by Adad Nirari. For whatever reason the Hittites did not give support to Wasashatta, who was likely put to death. When Adad Nirari was succeeded in Assyria by Shalmaneser I, the Mitanni rebelled again, this time under a new leader who called himself Shattuara II. Shalmaneser defeated Mitanni and apparently annex that kingdom into Assyria, thus ending the Kingdom of Mitanni.
It was also in the reign of Shalmaneser that Hattusili II and Ramesses II signed a peace treaty and eventually and alliance. Part of the treaty focused on containing Assyria and not allowing them to expand past the Euphrates. Both Adad Nirari and Shalmaneser had called themselves "Great King" and lobbied the Hittites and the Egyptians to be recognized as such. The four recognized great powers at the time were Egypt, Babylon, Mitanni, and Hatti, it is interesting that in the 1200's BC both of the rulers of "Ahhiyawa" and the Assyrians wished to be recognized as great kings and were therefore considered rogue states for waging wars and upsetting the balance. Shalmaneser had gone so far as to defeat the Hittites army in battle, a major defeat for the hard pressed Hittite Empire of Tudhaliya IV.
Within the century it seems that Ahhiyawa (Mycenaean Greece?), the Hittite Empire, and the Kassite Dynasty of Babylon had all fallen. Egypt had survived under the 20th Dynasty but after the death of Ramesses III that empire had begun to stagnate. Tukulti Ninurta I succeeded Shalmaneser I and he managed to defeat the Kassite Dynasty in Babylon, temporarily seizing control of the south of Mesopotamia and even campaigning in the Gulf against Elam. However over the next 30 years it looks as if the Assyrians stagnated and many kings came to power one after another.
During that time the Elamites somehow managed to take control of Babylon. They even marched up the Tigris as far as Arrapha and threatened the capital of Ashur itself. Ahur-Dan I was able to push the Elamites back into Babylon, he also spent much of his reign campaigning to secure cities in Upper Mesopotamia. After his death there was conflict between his sons, until the succession of his grandson Ashur-resh-ishi I.
During the reign of this king the Assyrians were faced by an invasion of Ahlamu barbarians from the Western desert, which the Assyrians managed to defeat. Although the invasion must have been sufficiently shocking that Ashur-resh-ishi ordered the the walls of Ashur to be rebuilt. Ashur-resh-ishi also campaigned in Babylonia and in the Zagros mountains to the east against the Babylonian Isin Dynasty which had managed to chase out the Elamites. The Assyrian campaigns against Ninurta-nadin-shuma and Nebuchadnezzar I were not conclusive.
Ahur-resh-ishi was succeeded by his son Tiglath-Pileser I. This king ruled from 1114 BC to 1076 BC. In his time he campaigned in Eastern Anatolia at the source of the Tigris and Euphrates. He also invaded Anatolia as far as Cappadocia and Cilicia, picking off Anatolian tribes and some of the Neo-Hittite states. He is also recorded to have invaded Syria and taken the coastal cities of Arvad, Sidon and Byblos. The rest of his rule saw him fighting off Aramean tribes which had invaded the Euphrates from the Syrian desert.
Not long after the death of Tiglath Pileser I his other son Ashur-bel-kala gained the throne (he ruled 1074 BC to 1056 BC). It was this king who made a peace treaty with Babylon. He spent his early reign campaigning against Urartu and in the Euphrates against the cities there, who had joined the rebel official Tukulti Mer. These rebels also accepted the aid of the Aramean tribes in the west, those hordes crossed the Euphrates and overran Upper Mesopotamia as far as the Khabur River. Ashur-bel-kala was forced to campaign against them and push them across the Euphrates, reclaiming cities such as Carchemish.
The end of the Middle Assyrian Period is generally considered to be with Ashur-bel-kala or later with Tiglath Pileser II (after 934 BC).