Campaigns focus on the progress of the army, including the fording of rivers, and usually culminate in the siege of a city, followed by the surrender and paying of tribute, and the return of the army home. A full and characteristic set shows the campaign leading up to the siege of Lachish in 701; it is the "finest" from the reign of Sennacherib, from his palace at Nineveh and now in the British Museum.[15] Ernst Gombrich observed that none of the many casualties ever come from the Assyrian side.[16] Another famous sequence there shows the Lion Hunt of Ashurbanipal, in fact the staged and ritualized killing by King Ashurbanipal of lions already captured and released into an arena, from the North Palace at Nineveh. The realism of the lions has always been praised, and the scenes are often regarded as "the supreme masterpieces of Assyrian art", although the pathos modern viewers tend to feel was perhaps not part of the Assyrian response.[17]