The site was excavated by the British Museum, between 1878 and 1881 through Consul Patrick Henderson and between 1911 and 1914 under the direction of D. G. Hogarth. In 1911 on the field there were D. G. Hogarth himself, R. C. Thompson, and T. E. Lawrence ("Lawrence of Arabia"), from 1912 to 1914 C. L. Woolley and T. E. Lawrence, while a last campaign took place in 1920 with C. L. Woolley and Philip Langstaffe Ord Guy. Excavations were interrupted in 1914 by World War I and then ended in 1920 with the Turkish War of Independence. These expeditions uncovered substantial remains of the Assyrian and Neo-Hittite periods, including defensive structures, temples, palaces, and numerous basalt statues and reliefs with Luwian hieroglyphic inscriptions. Between 1956 and 1998 the whole site had been mined by the Turkish Land Forces.