Subsequent researches by Hormuzd Rassam made it certain that Borsippa, the ancient name of the place where the tower and sanctuaries stood, was a suburb of the great city of Babylon itself, which lay directly opposite on the east side of the Euphrates.

The scope of the excavations continued to grow almost from year to year, and while new mounds were being attacked in the south, those in the north, especially Koujunjik, continued to be the subject of attention.
Rassam, who has just been mentioned, was in a favorable position, through his long residence as English consul at Mosul, for extracting new finds from the mounds in this vicinity.

Besides adding more than a thousand tablets from the royal library discovered by Layard, his most noteworthy discoveries were the unearthing of a magnificent temple at Nimrud, and the finding of a large bronze gate at Balawat, a few miles to the northeast of Nimrud.

Rassam and Rawlinson were afterwards joined by George Smith of the British Museum, who, instituting a further search through the ruins of Koujunjik, Nimrud, Kalah-Shergat, and elsewhere, made many valuable additions to the English collections, until his unfortunate death in 1876, during his third visit to the mounds, cut him off in the prime of a brilliant and most useful career.

The English explorers extended their labors to the mounds in the south.