The military successes of Hammurabi fall within two clearly defined periods, the first during the five years which followed his sixth year of rule at Babylon, and a second period, of ten years' duration, beginning with the thirteenth of his reign. On his accession he appears to have inaugurated the reforms in the internal administration of the country, which culminated towards the close of his life in the promulgation of his famous Code of Laws; for he commemorated his second year as that in which he established righteousness in the land. The following years were uneventful, the most important royal acts being the installation of the chief-priest in Kashbaran,[81] the building of a wall for the Gagûm, or great Cloister of Sippar, and of a temple to Nannar in Babylon. But with his seventh year we find his first reference to a military campaign in a claim to the capture of Erech and Nîsin. This temporary success against Damik-ilishu of Nîsin was doubtless a menace to the plans of Rîm-Sin at Larsa, and it would appear that Kudur-Mabuk came to the assistance of his son by threatening Babylon's eastern border. At any rate Hammurabi records a conflict with the land of Emutbal in his eighth year, and, though the attack appears to have been successfully repulsed with a gain of territory to Babylon,[82] the diversion was successful. Rîm-Sin took advantage of the respite thus secured to renew his attack with increased vigour upon Nîsin, and in the following year, the seventeenth of his own reign, the famous city fell, and Larsa under her Elamite ruler secured the hegemony in the whole of Central and Southern Babylonia. Rîm-Sin's victory must have been a severe blow to Babylon, and it would seem that she made no attempt at first to recover her position in the south, since Hammurabi occupied himself with a raid on Malgûm[83] in the west and with the capture of the cities of Rabikum and Shalibi. But these were the last successes during his first military period, and for nineteen years afterwards Babylon achieved nothing of a similar nature to commemorate in her date-formulæ. For the most part the years are named after the dedication of statues and the building and enrichment of temples. One canal was cut,[84] and the process of fortification went on, Sippar especially being put in a thorough state of defence.[85] But the negative evidence supplied by the formulæ for this period suggests that it was one in which Babylon completely failed in any attempt she may have made to hinder the growth of Larsa's power in the south.